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1.
Arch. argent. pediatr ; 122(4): e202410403, ago. 2024. ilus
Artigo em Espanhol | LILACS, BINACIS | ID: biblio-1562995

RESUMO

Las proteínas de la leche de vaca pueden causar alergia alimentaria. Los distintos mecanismos de acción involucrados y la variabilidad clínica según la etapa de la vida pediátrica en la que se manifieste ocasionan dificultades en su abordaje, con riesgo de sub- o sobrediagnóstico. En este proceso, intervienen profesionales de diversas áreas y es recomendable su interacción. Es por ello que el objetivo de este consenso ha sido reflejar el conocimiento actualizado desde la interdisciplina, generando recomendaciones para su correcto diagnóstico. Hemos trabajado con el método de Delphi para sumarle a la evidencia científica, la experiencia proveniente de neonatólogos, pediatras, especialistas en alergia, nutrición y gastroenterología. Pensamos que este enfoque interdisciplinario de trabajo va a resultar de utilidad práctica y promoverá una atención más integral de estos pacientes.


Cow's milk protein can cause food allergy. The different mechanisms of action involved, the clinical variability depending on the stage of pediatric life in which it manifests, leads to difficulties in its approach, with the risk of under- or over-diagnosis. Professionals from various areas intervene in this process and their interaction is recommended. That is why the objective of this consensus has been to reflect the updated knowledge in an interdisciplinary mode, generating recommendations for its correct diagnosis. We have worked with the Delphi method to add to the scientific evidence, the experience from neonatologists, pediatricians, experts in allergy, nutrition and gastroenterology. We think that this interdisciplinary approach will be of practical use and will promote more comprehensive care for these patients.


Assuntos
Humanos , Lactente , Pré-Escolar , Criança , Adolescente , Hipersensibilidade a Leite/diagnóstico , Técnica Delphi , Consenso
2.
Mol Biol Rep ; 51(1): 148, 2024 Jan 18.
Artigo em Inglês | MEDLINE | ID: mdl-38236307

RESUMO

BACKGROUND: ESR1 is expressed by 60-70% of breast tumours. it's a good prognosis factor and the target of hormone therapy. Optimization of ESR1 reactivation therapy is currently ongoing. Here we probe if the transcription factor CTCF plays a role in the differential expression of ESR1 in the breast cancer cell lines MCF-7 (ESR1+) and MDA-MB-231 (ESR1-). METHODS AND RESULTS: Knockdown of CTCF in MCF-7 resulted in decreased ESR1 gene expression. CTCF binds to the promoter of ESR1 in MCF-7 but not in MDA-MB-231 cells. CTCF ESR1 binding sites are unmethylated in MCF7 but methylated in MDA-MB-231 cells. CONCLUSION: ESR1 expression in MCF7 cells is dependent on CTCF expression. CTCF can bind to specific regions of the promotor of ESR1 gene in MCF-7 cells but not in MDA-MB-231 cells, this correlates with the methylation status of these regions and could be involved in the transcriptional regulation of ESR1.


Assuntos
Neoplasias da Mama , Fator de Ligação a CCCTC , Metilação de DNA , Receptor alfa de Estrogênio , Humanos , DNA , Metilação de DNA/genética , Células MCF-7 , Células MDA-MB-231 , Neoplasias da Mama/genética , Regiões Promotoras Genéticas , Fator de Ligação a CCCTC/genética , Receptor alfa de Estrogênio/genética
3.
Arch. argent. pediatr ; 121(2): e202202894, abr. 2023. tab
Artigo em Espanhol | LILACS, BINACIS | ID: biblio-1425155

RESUMO

La rinitis alérgica (RA) es una de las enfermedades crónicas más frecuentes de la infancia. Sin embargo, permanece subdiagnosticada y subtratada. Su prevalencia ha aumentado en los últimos años y varía del 2 % al 25 %. Los síntomas de la RA incluyen estornudos, prurito, rinorrea y congestión nasal. Un correcto diagnóstico y tratamiento de la RA y sus comorbilidades, tales como rinosinusitis con o sin poliposis nasal, conjuntivitis, otitis media, asma bronquial e infecciones del tracto respiratorio, son importantes para reducir el impacto negativo en la afectación de la calidad de vida del paciente y sus familiares, y los gastos sanitarios que ocasiona. La inmunoterapia alérgeno específica, en pacientes correctamente seleccionados, previene nuevas sensibilizaciones y reduce la hiperreactividad bronquial asociada a la RA. Considerando todos estos factores, el Comité Nacional de Alergia de la Sociedad Argentina de Pediatría propone recomendaciones basadas en la evidencia actual.


Allergic rhinitis (AR) is one of the most common chronic diseases in children. However, it remains underdiagnosed and undertreated. Its prevalence has increased in recent years and varies from 2 to 25 %. Symptoms include sneezing, itching, runny nose, and nasal congestion. A correct diagnosis and treatment of AR and its comorbidities such as rhinosinusitis with or without nasal polyposis, conjunctivitis, otitis media, bronchial asthma and respiratory tract infections, are important to reduce the negative impact on the quality of life of the patient and their relatives, and in medical costs. Specific allergen immunotherapy, in correctly selected patients, prevents new sensitizations and reduces bronchial hyperreactivity associated with AR. Taking into account all these reasons, the National Allergy Committee of the Sociedad Argentina de Pediatría proposes current evidence based recommendations


Assuntos
Humanos , Criança , Pediatria , Asma/complicações , Rinite/complicações , Rinite Alérgica Perene/diagnóstico , Rinite Alérgica Perene/terapia , Rinite Alérgica Perene/epidemiologia , Rinite Alérgica/diagnóstico , Rinite Alérgica/terapia , Rinite Alérgica/epidemiologia , Qualidade de Vida
4.
Arch Argent Pediatr ; 121(2): e202202894, 2023 04 01.
Artigo em Espanhol | MEDLINE | ID: mdl-36924507

RESUMO

Allergic rhinitis (AR) is one of the most common chronic diseases in children. However, it remains underdiagnosed and undertreated. Its prevalence has increased in recent years and varies from 2 to 25 %. Symptoms include sneezing, itching, runny nose, and nasal congestion. A correct diagnosis and treatment of AR and its comorbidities such as rhinosinusitis with or without nasal polyposis, conjunctivitis, otitis media, bronchial asthma and respiratory tract infections, are important to reduce the negative impact on the quality of life of the patient and their relatives, and in medical costs. Specific allergen immunotherapy, in correctly selected patients, prevents new sensitizations and reduces bronchial hyperreactivity associated with AR. Taking into account all these reasons, the National Allergy Committee of the Sociedad Argentina de Pediatría proposes current evidence based recommendations.


La rinitis alérgica (RA) es una de las enfermedades crónicas más frecuentes de la infancia. Sin embargo, permanece subdiagnosticada y subtratada. Su prevalencia ha aumentado en los últimos años y varía del 2 % al 25 %. Los síntomas de la RA incluyen estornudos, prurito, rinorrea y congestión nasal. Un correcto diagnóstico y tratamiento de la RA y sus comorbilidades, tales como rinosinusitis con o sin poliposis nasal, conjuntivitis, otitis media, asma bronquial e infecciones del tracto respiratorio, son importantes para reducir el impacto negativo en la afectación de la calidad de vida del paciente y sus familiares, y los gastos sanitarios que ocasiona. La inmunoterapia alérgeno específica, en pacientes correctamente seleccionados, previene nuevas sensibilizaciones y reduce la hiperreactividad bronquial asociada a la RA. Considerando todos estos factores, el Comité Nacional de Alergia de la Sociedad Argentina de Pediatría propone recomendaciones basadas en la evidencia actual.


Assuntos
Asma , Pediatria , Rinite Alérgica Perene , Rinite Alérgica , Rinite , Humanos , Criança , Qualidade de Vida , Rinite Alérgica Perene/diagnóstico , Rinite Alérgica Perene/epidemiologia , Rinite Alérgica Perene/terapia , Rinite Alérgica/diagnóstico , Rinite Alérgica/terapia , Rinite Alérgica/epidemiologia , Asma/complicações , Rinite/complicações
6.
Artigo em Espanhol | LILACS-Express | LILACS | ID: biblio-1537049

RESUMO

En los últimos años, el ají (Capsicum chinense, Capsicum frutescens y Capsicum annuum var. Acuminatum), cultivado en el Valle del Cauca, se ha visto afectado por enfermedades virales causadas por Cucumber mosaic virus (CMV-ají) y Pepper severe mottle virus (PepSMoV). Pese a que estos dos virus son limitantes para producción del cultivo de ají, en la actualidad, pocos estudios han identificado los hospederos alternos de CMV-ají y PepSMoV. En este trabajo, se evaluó la presencia de CMV-ají y PepSMoV, mediante RT-PCR, en muestras de tejido foliar, de 121 plantas arvenses, asociadas al cultivo de ají, en el Valle del Cauca, Colombia. El análisis molecular indicó la presencia de CMV-ají, en el 21,4 % de las plantas recolectadas y de PepSMoV, en el 20,6 %. Se identificaron las especies arvenses Amaranthus viridis, Parthenium hysterophorus, Hippobroma longiflora, Commelina diffusa, Clitoria ternatea, Crotalaria incana, Desmodium tortuosum, Desmodium intortum, Macroptilium lathyroides, Anoda acerifolia, Boerhavia erecta, Bougainvillea glabra, Rivina humilis, Browallia americana, Capsicum rhomboideum, Solanum americanum y Lantana camara, como hospederas de CMV-ají o PepSMoV. Se presentó infección mixta de CMV-ají y PepSMoV, en 57 % de las arvenses positivas a virus, las cuales, están distribuidas en zonas productores de ají, localizadas en seis municipios del Valle del Cauca. Estos resultados brindan información sobre la distribución de estos virus en el Valle del Cauca, contribuyen al conocimiento de la epidemiología viral y servirán para diseñar medidas de manejo, orientadas a prevenir las infecciones virales en los cultivos de ají.


In recent years, chili pepper (Capsicum chinense, Capsicum frutescens y Capsicum annuum var. Acuminatum) grown in Valle del Cauca has been affected by viral diseases caused by Cucumber mosaic virus (CMV-chili pepper) and Pepper severe mottle virus (PepSMoV). Although these two viruses are limiting to the production of the chili pepper crop, at present, few studies have identified the alternate hosts of CMV-chili pepper and PepSMoV. In this work, the presence of CMV-chili pepper and PepSMoV were evaluated by RT-PCR in leaf tissue samples from 121 weed plants associated with chili pepper cultivation in Valle del Cauca, Colombia. Molecular analysis indicated the presence of CMV-chili pepper in 21.4 % of the collected plants and PepSMoV in 20.6 %. Weed species Amaranthus viridis, Parthenium hysterophorus, Hippobroma longiflora, Commelina diffusa, Clitoria ternatea, Crotalaria incana, Desmodium tortuosum, Desmodium intortum, Macroptilium lathyroides, Anoda acerifolia, Boerhavia erecta, Bougainvillea glabra, Rivina humilis, Browallia americana, Capsicum rhomboideum, Solanum americanum and Lantana camara, as hosts of CMV-chili pepper or PepSMoV. Mixed infection of CMV-chili pepper and PepSMoV was present in 57 % of the weeds positive for viruses, which are distributed in chili pepper producing areas located in six municipalities of Valle del Cauca. These results provide information on the distribution of these viruses in Valle del Cauca. Contribute to the knowledge of viral epidemiology and will serve to design management measures aimed to prevent viral infections in chili pepper crops.

7.
Bol. méd. Hosp. Infant. Méx ; 79(6): 363-368, Nov.-Dec. 2022. tab
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1429926

RESUMO

Abstract Background: Pregnancy-induced hypertension (PIH) has been related to impaired fetal growth, possibly by affecting hematopoiesis. This study aimed to analyze the most frequent hematological alterations in preterm infants born to mothers with PIH. Methods: We conducted a cross-sectional study in newborns born to mothers with PIH. We reviewed 130 hemograms of preterm infants: 45 from mothers with PIH, 71 with preeclampsia, and 14 with HELLP syndrome (hemolysis, elevated liver enzymes, and low platelet count). Normality, cytosis conditions, or cytopenia values were adjusted for gestational ages. Differences between groups were analyzed with classical and Bayesian statistics (BF01 = null/alternative hypothesis ratio). Results: Anemia was found in only 1.2% of newborns. In the white blood cell count, the most frequent finding was lymphopenia (56.2%) and monocytosis (38.5%) (p = 0.6, FB01 = 249 y p = 0.81, FB01 = 19.9). Thrombocytopenia was found in 12.5% (p = 0.56, FB01 = 67). No significant differences were observed among PIH groups. Conclusions: Hematological alterations of newborns born to mothers with PIH are frequent and do not show a distinct pattern related to the severity of the affection in the mother. We recommend a full hematological evaluation in these preterm neonates.


Resumen Introducción: La enfermedad hipertensiva del embarazo (EHE) se ha relacionado con alteraciones en el crecimiento fetal, posiblemente porque afecta la hematopoyesis. El objetivo de este estudio fue analizar las alteraciones hematológicas más frecuentes en los recién nacidos prematuros hijos de madres con EHE. Métodos: Se llevó a cabo un estudio transversal en recién nacidos de madres con EHE. Se revisaron los hemogramas de 130 neonatos prematuros: 45 madres con hipertensión gestacional, 71 con pre-eclampsia y 14 con síndrome de HELLP (hemólisis, enzimas hepáticas elevadas y bajo recuento de plaquetas). Las cifras de normalidad, condiciones de citosis o citopenia fueron ajustadas a las edades gestacionales. Las diferencias entre los grupos se analizaron con estadística clásica y bayesiana (FB01= relación hipótesis nula/alterna). Resultados: Se encontró anemia en solo el 1.2% de los recién nacidos. En la serie blanca el hallazgo más frecuente fue la linfopenia (56.2%) y monocitosis (38.5%) (p = 0.6, FB01 = 249 y p = 0.81, FB01 = 19.9). La plaquetopenia se encontró en el 12.5% (p = 0.56, FB01 = 67). No se observaron diferencias significativas entre los grupos de EHE. Conclusiones: Las alteraciones hematológicas en recién nacidos de madres con EHE son frecuentes sin mostrar un patrón distinto con relación a la gravedad del padecimiento de la madre. Aun así, es recomendable la valoración hematológica en estos neonatos.

8.
Rev. colomb. biotecnol ; 24(1): 6-18, ene.-jun. 2022. tab, graf
Artigo em Espanhol | LILACS-Express | LILACS | ID: biblio-1407961

RESUMO

RESUMEN Los hidrocarburos aromáticos monocíclicos: benceno, tolueno, etilbenceno y xileno (BTEX), presentes en crudo y refinados de petróleo, hacen parte de los compuestos con más impacto en el medio ambiente y la salud humana, debido a su naturaleza cancerígena, mutagénica y altamente tóxica. Esta investigación tuvo como objetivo obtener y caracterizar bacterias capaces de degradar tolueno. Se realizaron tres muestreos de suelo contaminado con hidrocarburos del Valle del Cauca en tres condiciones: gasolinería, derrame accidental y taller mecánico. Se aislaron bacterias capaces de crecer en tolueno fase vapor como única fuente de carbono y se caracterizaron a nivel morfológico, bioquímico y molecular. Para la caracterización molecular se amplificó, secuenció y analizó con herramientas bioinformáticas el gen ribosomal 16S. Se evaluó la utilización de tolueno directo con concentración al 1% como única fuente de carbono. Se logró aislar 29 bacterias con capacidad de metabolizar tolueno. La caracterización bioquímica y molecular identificó a las bacterias aisladas de suelo contaminado como Pseudomonas y Stenotrophomonas. Las bacterias aisladas en el taller mecánico resultaron ser los microorganismos con mejor crecimiento en tolueno como fuente de carbono, poseen un gran potencial para ser utilizadas para fines de biorremediación de suelos y aguas contaminadas con tolueno.


ABSTRACT Monocyclic aromatic hydrocarbons: benzene, toluene, ethylbenzene, and xylene (BTEX), present in crude oil and refined petroleum products, they are the compounds with a big impact on the environment and human health, due to their carcinogenic, mutagenic, and highly toxic. This research aimed to obtain and characterize bacteria capable of degrading toluene. Three samples of soil contaminated with hydrocarbons were carried out in three different conditions: oil station, accidental oil spill, and mechanical workshop. Bacteria capable of growing in toluene vapor as the unique carbon source were isolated and characterized at a morphological, biochemical, and molecular level. For molecular characterization, the 16S ribosomal gene was amplified, sequenced, and analyzed with bioinformatic tools. The use of direct toluene with 1% concentration as the sole carbon source was evaluated. It was possible to isolate 29 bacteria with the capacity to metabolize toluene. Biochemical and molecular characterization identified bacteria isolated from contaminated soil as Pseudomonas and Stenotrophomonas. The isolated strains in the mechanical workshop were the microorganisms with the best growth in toluene as a carbon source, they have great potential to be used for the bioremediation of soils and waters with toluene pollution.

9.
Life (Basel) ; 12(3)2022 Feb 22.
Artigo em Inglês | MEDLINE | ID: mdl-35330078

RESUMO

Pancreatic cancer has one of the highest mortality rates among cancers, and a combination of nab-paclitaxel with gemcitabine remains the cornerstone of first-line therapy. However, major advances are required to achieve improvements in patient outcomes. For this reason, several research groups have proposed supplementing treatment with other therapeutic agents. Ongoing studies are being conducted to find the optimal treatment in a first-line setting. In this work, we used a search strategy to compare studies on the efficacy and safety of nab-paclitaxel with gemcitabine in combination with other therapeutic agents based on the criteria of the Preferred Reporting Items for Systematic Reviews. We found seven studies in different clinical phases that met the inclusion criteria. The seven therapeutic agents were ibrutinib, necuparanib, tarextumab, apatorsen, cisplatin, enzalutamide, and momelotinib. Although these therapeutic agents have different mechanisms of action, and molecular biology studies are still needed, the present review was aimed to answer the following question: which formulations of the nab-paclitaxel/gemcitabine regimen in combination with other therapeutic agents are safest for patients with previously untreated metastatic pancreas ductal adenocarcinoma? The triple regimen is emerging as the first-line option for patients with pancreatic cancer, albeit with some limitations. Thus, further studies of this regimen are recommended.

10.
J Am Nutr Assoc ; 41(1): 94-106, 2022 01.
Artigo em Inglês | MEDLINE | ID: mdl-33570477

RESUMO

Survivors of breast cancer (BC) are at increased risk of chronic diseases due to factors such as low bone mineral density (BMD) and loss of muscle mass (MM) coupled with increased fat mass (FM). It is important to know that healthy behaviors can mitigate the risk of these complications. A narrative review was performed using PubMed and ScienceDirect to identify diet and physical activity (PA) interventions aimed at improving BMD, MM, and/or FM in female BC survivors. Data from 2000 to 2018 were used and 17 diet and/or PA interventions were identified. The duration of interventions was from 3 weeks until 24 months, the smallest sample was 26 women, and the largest was 223. The ranging age of participants was from 46 to 64 years. Studies with a longer duration, in-person modality and/or that used behavioral models showed better results. In BMD, the best results in spine were observed at 24 months in a face-to-face intervention (increase of 3.08%). Regarding MM, the greatest increase was at 26 weeks under Cognitive Behavioral Therapy (CBT) in person (43.8 ± 8.7 to 44.7 ± 8.4 kg, p = 0.04). This approach also showed the greatest decrease in FM from 36.7 to 31.2 kg in 4 months (p ≤ 0.01). Improving BMD and MM and preventing the increase of FM is a challenge for public health. More studies are needed to improve BMD among BC survivors and consider strategies that have yielded better results to promote healthy changes.Key teaching pointsBreast cancer survivors are at increased risk for low bone mineral density, loss of muscle mass, and increased fat mass due to the treatments received; the adoption of a healthy diet and physical activity can mitigate these complications.Of the 17 studies included, 8 used the face-to-face modality, 7 combined face-to-face with phone calls and two studies used only phone calls and email; studies that used the face-to-face modality showed better results.For bone mineral density, the best results were observed in spine at 24 months (increase of 3.08%) in a face-to-face intervention.The greatest increase in muscle mass (43.8 to 44.7 kg) was at 26 weeks in a physical activity intervention; the larger amount of fat mass loss was 5.5 kg in a diet and physical activity intervention. Both results were obtained using the Cognitive Behavioral Therapy (CBT) in person.Lifestyle interventions to maintain or improve bone mineral density, muscle mass and fat mass are effective at least for one of these three variables.


Assuntos
Doenças Ósseas Metabólicas , Neoplasias da Mama , Sobreviventes de Câncer , Densidade Óssea/fisiologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Músculos , Sobreviventes
11.
Arch. latinoam. nutr ; 71(3): 178-188, sept. 2021. tab
Artigo em Espanhol | LILACS, LIVECS | ID: biblio-1353191

RESUMO

Los problemas relacionados con los trastornos metabólicos se han incrementado en la actualidad en población joven. Promover un estilo de vida saludable en estudiantes universitarios puede ayudar a prevenir diabetes, enfermedades cardiovasculares y diferentes tipos de cáncer. Objetivo. Calcular el Índice de Masa Corporal (IMC) de universitarios para identificar la prevalencia de obesidad e hipertensión como factores de riesgo metabólico. Materiales y método. Se utilizó muestreo probabilístico aleatorio simple (n= 282, edad 19,1 ± 1,8, 54,6% mujeres, 48,5% hombres). Se realizaron mediciones de peso y estatura para calcular el IMC, circunferencia de cintura y presión arterial. Resultados. Los resultados promedio para mujeres y hombres respectivamente fueron: IMC 24,0 ±5,5 y 25,2 ±5,2 kg/m2 (p= 0,25); cintura 76,25 ± 11,87 y 82,32 ± 15,85 cm (p= 0,001), indicando un riesgo bajo en 73,1% de mujeres y 82,5% de hombres; y presión arterial 127,73/86,03 y 142,3/94,2 mmHg (p= 0,001). La probabilidad de tener hipertensión arterial fue mayor al tener una relación cintura/estatura (RCE) alterada en mujeres y hombres (OR=3,037; IC95% 1,385-6,657 y OR=3,664; IC95% 1,249-2,179, respectivamente). Conclusiones. La población universitaria presenta factores de riesgo que pueden derivar en enfermedades crónicas no transmisibles en un futuro próximo, por lo cual es necesario modificar sus estilos de vida. La RCE es un buen predictor de riesgo de hipertensión en esta población(AU)


The problems related to metabolic disorders have now increased in the young population. Promoting a healthy lifestyle in college students can help prevent diabetes, cardiovascular disease, and different types of cancer. Objective. To calculate the Body Mass Index (BMI) in college students to identify the prevalence of obesity and hypertension as metabolic risk factors. Materials and methods. Simple random probability sampling was used (n = 282, age 19,1 ± 1,8, 54,6% women, 48,5% men). BMI was calculated with weight and height, waist circumference, and blood pressure. Results. The average results for women and men respectively were: BMI 24,0 ± 5,5 and 25,2 ± 5,2 kg/m2 (p = 0,25); waist 76,25 ± 11,87 and 82,32 ± 15,85 cm (p = 0,001), indicating a low risk in 73,1% of women and 82,5% of men; and blood pressure 127,73 / 86,03 and 142,3 / 94,2 mm Hg (p = 0,001). The probability of having arterial hypertension was higher when there was an altered waist / height ratio (WHR) in women and men (OR = 3,037; 95% CI 1,385-6,657 and OR = 3,664; 95% CI 1,249-2,179, respectively). Conclusions. The university population presents risk factors that could lead to chronic diseases. It is necessary to modify their lifestyles to prevent future diseases. WHR is a good predictor of hypertension risk in this population(AU)


Assuntos
Humanos , Masculino , Feminino , Adolescente , Adulto , Índice de Massa Corporal , Doença Crônica , Circunferência da Cintura , Pressão Atrial , Razão Cintura-Estatura , Doenças não Transmissíveis , Estudantes , Universidades , Fatores de Risco , Obesidade Infantil , Estilo de Vida
12.
Arch. argent. pediatr ; 118(1): S1-S11, 2020-02-00. ilus, tab
Artigo em Espanhol | LILACS, BINACIS | ID: biblio-1096405

RESUMO

Los antiinflamatorios no esteroideos son ampliamente recetados en niños. Constituyen la segunda causa de reacciones a medicamentos en pediatría después de los antibióticos betalactámicos; sin embargo, solo una parte de estas son reacciones de hipersensibilidad. La prevalencia de dichas reacciones a antiinflamatorios no esteroideos en niños es del 0,3 % y aumenta al 5 % en asmáticos.Los mecanismos fisiopatológicos involucrados (inhibición de la ciclooxigenasa, hipersensibilidad mediada por inmunoglobulina E, linfocitos T reactivos y/o afectación de la inmunidad innata) darán lugar a diferentes entidades clínicas con sintomatología dispar.La confusión con síntomas propios de procesos virales y la variabilidad clínica hacen del diagnóstico de certeza un verdadero desafío. Una historia clínica detallada, análisis de laboratorio, pruebas cutáneas y de provocación controlada permitirán definir estrategias para cada paciente en particular sin etiquetar como alérgico a un niño que no lo es ni exponer a riesgos innecesarios a quien está sensibilizado.


Nonsteroidal anti-inflammatory drugs are widely prescribed in children. They are the second cause of drug ́s reactions in pediatrics after beta-lactam antibiotics, however only a part of them are hypersensitivity reactions. The prevalence of these reactions to nonsteroidal anti-inflammatory drugs in children is 0.3 %, increasing to 5 % in asthmatics.The different physiopathological mechanisms involved (inhibition of cyclooxygenase, immunoglobulin E-mediated hypersensitivity, reactive T lymphocytes and/or disturbance of innate immunity) will cause different clinical entities with diverse symptoms.The confusion between the common symptoms of a viral infection and a hypersensitivity reaction, and the variability of the clinical presentations make diagnosis a real challenge.A detailed clinical history, laboratory, skin and controlled provocation tests will provide strategies for each patient, without labeling a child who is not an allergic one, or taking unnecessary risks with those who are sensitized.


Assuntos
Humanos , Masculino , Feminino , Lactente , Pré-Escolar , Criança , Adolescente , Anti-Inflamatórios não Esteroides , Hipersensibilidade a Drogas/diagnóstico , Hipersensibilidade a Drogas/tratamento farmacológico , Testes Cutâneos , Reações Cruzadas , Hipersensibilidade a Drogas/prevenção & controle
13.
Acta biol. colomb ; 24(3): 452-462, Sep.-Dec. 2019. tab, graf
Artigo em Espanhol | LILACS-Express | LILACS | ID: biblio-1054639

RESUMO

RESUMEN Virus del género Begomovirus infectan cultivos de importancia económica en todo el mundo, incluyendo ají. A la fecha, en Colombia no hay reportes de la presencia de begomovirus infectando este cultivo, por lo que el objetivo de esta investigación fue identificar la presencia de virus de este género en ají empleando estrategias moleculares. Se colectaron 197 muestras de ají en diez municipios del Valle del Cauca. Se extrajo el DNA genómico total vegetal y mediante PCR se detectó la presencia de begomovirus. Para establecer la identidad molecular del virus se amplificaron fragmentos de 1,4 kb de muestras colectadas en Palmira y Vijes. Los fragmentos fueron clonados, secuenciados y analizados. Se encontró que el 85,7 % de las muestras de ají evaluadas fueron positivas para begomovirus. Los análisis de secuencia de los fragmentos virales de 1,4 kb arrojaron una identidad de 91,8 % entre ellos y los de secuencia de nucleótidos de los virus aislados en Vijes y Palmira mostró que éstos presentan los valores de identidad más altos (87,2 % y 86,6 %) con el virus de la distorsión de la hoja de maracuyá, un begomovirus aislado de maracuyá en Colombia. Estos análisis estarían indicando que este begomovirus aislado de ají podría ser una nueva especie. De acuerdo con la literatura, este es el primer reporte de un begomovirus infectando cultivos de ají en Colombia.


ABSTRACT Viruses of the genus Begomovirus infect crops of economic importance around the world, including pepper. To date, in Colombia there are no reports of the presence of begomoviruses infecting this crop; therefore, this research work aimed to identify the presence of viruses of this genus in pepper using molecular strategies. Around 197 pepper samples were collected in ten municipalities in Valle del Cauca. Total plant genomic DNA was extracted, and the presence of begomoviruses was detected by using PCR. In order to establish the molecular identity of the virus, fragments of 1.4 kb were amplified from samples collected in Palmira and Vijes municipalities. The fragments obtained were cloned, sequenced, and analyzed. The results show that about 85.7 % of the pepper samples evaluated were positive for begomoviruses. Sequence analysis of the viral fragments of 1.4 kb showed an identity of 91.8 % among them. The nucleotide sequence analysis of the begomoviruses isolated in Vijes and Palmira showed its highest identity values (87.2 % and 86.6 %) with the passion fruit leaf distortion virus, a begomovirus that is affecting passion fruit crops in Colombia. These sequences analyze would indicate that this begomovirus isolated from pepper could be a new species that has not been reported worldwide. To our knowledge, this is the first report of a begomovirus infecting pepper crops in Colombia.

14.
Acta biol. colomb ; 24(3): 528-537, Sep.-Dec. 2019. tab, graf
Artigo em Espanhol | LILACS-Express | LILACS | ID: biblio-1054647

RESUMO

RESUMEN Las arvenses son hospederos alternos de begomovirus (Geminiviridae), los cuales facilitan su persistencia y propagación a cultivos de interés agronómico, como el tomate. El objetivo de esta investigación fue obtener el genoma completo de un begomovirus bipartita encontrado en Amaranthus dubius, Rivina humilis, Rhynchosia minima, Desmodium sp. y Caesalpinia sp., las cuales fueron colectadas en cultivos de tomate en Ginebra y Cerrito, Valle del Cauca. El genoma del begomovirus fue obtenido utilizando amplificación por círculo rodante y digestión con las enzimas EcoRI y EcoRV, las cuáles cortan el componente genómico A y B, respectivamente. Estos fragmentos fueron clonados, secuenciados y analizados. Finalmente, se verificó la presencia de este begomovirus en todas las arvenses mediante PCR específico. Se obtuvieron tres clonas EcoRI y cinco clonas EcoRV. Los fragmentos que portan los componentes A y B presentan un tamaño de 2 584 y 2 543 nt, respectivamente. El análisis de secuencia de nucleótidos del genoma begomoviral A con otros begomovirus previamente reportados, mostró la mayor identidad (90,9 %) con el virus del mosaico dorado de Rhynchosia de Yucatán. Tomando como base el criterio de demarcación actual para las especies de Begomovirus establecido por el Comité Internacional de Taxonomía de Virus, el geminivirus aislado de las arvenses A. dubius, R. humilis, R. minima, Desmodium sp. y Caesalpinia sp., constituye una nueva especie begomoviral. Con base en la sintomatología observada en campo, se propone el nombre de Virus del mosaico dorado de Rhynchosia de Colombia para designar a esta nueva especie.


ABSTRACT The weeds are alternative hosts of begomoviruses (Geminiviridae), which facilitate their persistence and propagation to crops of agronomic interest, such as tomatoes. The objective of this investigation was to obtain the complete genome of a bipartite begomovirus found in Amaranthus dubius, Rivina humilis, Rhynchosia minima, Desmodium sp. and Caesalpinia sp., which were collected in tomato crops in Ginebra and Cerrito, Valle del Cauca. The genome of the begomovirus was obtained using rolling circle amplification and digestion with the enzymes EcoRI and EcoRV, which cut the genomic component A and B, respectively. These fragments were cloned, sequenced, and analyzed. Finally, the presence of this begomovirus in all weeds was verified by specific PCR. Three EcoRI clones and five EcoRV clones were obtained. The fragments carrying components A and B have a size of 2 584 and 2 543 nt, respectively. The analysis of the nucleotide sequence of the begomoviral A genome with other previously reported begomoviruses showed the highest identity (90.9 %) with the Rhynchosia golden mosaic virus Yucatán. Based on the current demarcation criterion for the Begomovirus species established by the International Committee on Taxonomy of Viruses, the geminivirus isolated from the weeds A. dubius, R. humilis, R. minima, Desmodium sp. and Caesalpinia sp., constitutes a new begomoviral species. Based on the symptoms observed in the field, the name of the Rhynchosia golden mosaic Colombia virus is proposed to designate this new species.

15.
Rev. colomb. biotecnol ; 21(1): 91-100, ene.-jun. 2019. graf
Artigo em Espanhol | LILACS-Express | LILACS | ID: biblio-1013902

RESUMO

RESUMEN Los avances biotecnológicos en plantas requieren la bioprospección de nuevos promotores para la expresión de genes de interés agronómico, en particular, es necesario caracterizar nuevos promotores con expresión tejido específica. El objetivo de esta investigación fue evaluar la actividad de expresión del promotor del gen AV1 que codifica para la proteína de la cápside (CP) del virus de la distorsión de la hoja de maracuyá (Passion fruit leaf distortion virus, PLDV) mediante ensayos transitorios de biobalística de baja presión. Se realizó un análisis de la región promotora del gen AV1 empleando herramientas bioinformáticas. Se construyó una fusión traduccional (CP-PLDV-GUS), que porta la región promotora del gen AV1 de PLDV fusionada al gen reportero uidA (GUS). CP-PLDV-GUS fue bombardeado sobre hojas de plántulas de tabaco cultivadas in vitro empleando una pistola de genes. Como control positivo se utilizó el plásmido pBI121 que porta el gen GUS bajo el control del promotor 35S de CaMV. Se llevaron a cabo 11 repeticiones, donde la unidad experimental fue la hoja y la variable de respuesta, la expresión transitoria del gen GUS representado por el número de puntos azules observados en las hojas bombardeadas. Como resultado, el análisis estadístico no paramétrico demostró que existe evidencia muestral suficiente para confirmar que, tanto el promotor AV1 del PLDV y 35S de CaMV presentan una actividad de expresión semejante. Finalmente, el promotor del gen AV1 de PLDV mostró una fuerte actividad de expresión del gen reportero en las células del mesófilo de las hojas, el cual podría ser usado para conferir expresión tejido específica en plantas transgénicas.


ABSTRACT Biotechnological advances in plants require the bioprospecting of new promoters for the gene´s expression of agronomic interest, in particular, it is necessary to characterize new promoters with tissue-specific expression The objective of this research was to evaluate the expression activity of the AV1 gene promoter that codes for the capsid protein (CP) of the Passion fruit leaf distortion virus (PLDV) by means of transient tests of low pressure biobalistics. An analysis of the promoter region was carried out using bioinformatics tools. A CP-PLDV-GUS translational fusion was constructed, which carries the promoter region of the AV1 gene of PLDV fused to the uidA reporter gene (GUS). CP-PLDV-GUS was bombarded on leaves of tobacco seedlings grown in vitro using a gene gun. As a positive control pBI121 carrying the GUS gene under the control of the 35S promoter of CaMV was used. It was carried out 11 repetitions where the experimental unit was the leaf and the response variable the transient expression of the GUS gene represented by number of blue dots observed in the bombarded leaves. As a result, the non-parametric statistical analysis showed that there is sufficient sample evidence to confirm that both the AV1 promoter of PLDV and 35S of CaMV exhibit similar expression activity. Finally, the promoter of the AV1 gene of PLDV showed a strong activity of expression of the reporter gene in the leaf mesophyll cells, which could be used to confer tissue-specific expression in transgenic plants.

16.
Nutr Hosp ; 35(4): 979-992, 2018 Aug 02.
Artigo em Espanhol | MEDLINE | ID: mdl-30070891

RESUMO

INTRODUCTION: strategies to improve diet and physical activity (PA) in intervention studies among breast cancer (BC) survivors can increase adherence to healthy lifestyles and improve some psychological variables such a quality of life, sleep quality, and anxiety. OBJECTIVE: to analyze studies about interventions on diet, PA and psychological variables in BC survivors; to evaluate the obtained results, and determine the methodology and strategy used. METHODOLOGY: the search was conducted from March 2016 to December 2017 in PubMed and Google Schoolar Metasearch. We reviewed the existing literature from 2006 to 2017 about lifestyle interventions in breast cancer survivors and their effect on psychological variables. Free-access publications in English and Spanish were included, and abstracts of congresses, restricted access or study protocols were excluded. For the identification of the articles, the following keywords or their combination were used: diet and breast cancer, physical activity and breast cancer, anxiety, depression, quality of life, psychological variables. From the selected articles, a qualitative analysis was carried out considering the methodology used, the strategy under which the changes were promoted, and achievements at the end of the program. RESULTS: sixteen intervention studies were identified, and 100% of them obtained positive results. The practice of physical activity improved quality of life and decreased fatigue, anxiety and depression. The interventions that used healthy changes based on diet reported that survivors improved their quality of life and sleep quality, and decreased fatigue and depressive symptoms. CONCLUSION: there are few interventions aimed at improving diet and PA that consider psychological variables in BC survivors; although all have obtained positive results, it is not known whether these results are maintained in the long term.


Introducción: las estrategias para mejorar la dieta y actividad física (AF) en estudios de intervención en sobrevivientes de cáncer de mama (CaMa) pueden aumentar la adherencia a estilos de vida saludables y mejorar algunas variables psicológicas como calidad de sueño, calidad de vida y ansiedad.Objetivo: analizar estudios sobre intervenciones en dieta y AF y su efecto en variables psicológicas en sobrevivientes de CaMa, evaluar los resultados obtenidos, metodología y estrategia utilizadas.Metodología: la búsqueda se realizó desde marzo de 2016 hasta diciembre de 2017 en PubMed y Metabuscador Google Schoolar. Se revisó la literatura existente de 2006 a 2017 sobre intervenciones de estilo de vida en sobrevivientes de cáncer de mama y su efecto en variables psicológicas. Se incluyeron publicaciones de acceso libre en inglés y español y se excluyeron aquellos que fueran resúmenes de congresos, de acceso restringido o protocolos de estudios. Para la identificación de artículos se utilizaron las siguientes palabras claves o su combinación: alimentación y cáncer de mama, actividad física y cáncer de mama, ansiedad, depresión, calidad de vida y variables psicológicas. De los artículos seleccionados se llevó a cabo un análisis cualitativo de la metodología utilizada, de la estrategia empleada para promover los cambios y de logros al final del programa.Resultados: se identificaron 16 estudios de intervención; el 100% obtuvo resultados positivos. La práctica de actividad física mejoró la calidad de vida y disminuyó la fatiga, la ansiedad y la depresión. En las intervenciones donde se hicieron cambios saludables en la alimentación, las sobrevivientes mejoraron su calidad de vida y la calidad de sueño y disminuyeron la fatiga y los síntomas depresivos.Conclusiones: son pocas las intervenciones para mejorar dieta y AF que consideran variables psicológicas en sobrevivientes de CaMa; aunque todas han obtenido resultados positivos, no se conoce si estos se mantienen a largo plazo.


Assuntos
Neoplasias da Mama/psicologia , Neoplasias da Mama/terapia , Promoção da Saúde , Estilo de Vida Saudável , Dieta , Exercício Físico , Feminino , Humanos , Sobreviventes/psicologia
17.
Bol. méd. Hosp. Infant. Méx ; 75(4): 237-243, jul.-ago. 2018. tab
Artigo em Espanhol | LILACS | ID: biblio-974049

RESUMO

Resumen Introducción: El bajo peso neonatal (< 2.5 kg o < percentil 10) se atribuye a causas constitucionales (pequeño para la edad gestacional [PEG]) o a la restricción en el crecimiento intrauterino (RCIU), con riesgos posnatales diferentes. En ausencia de una valoración fetal-placentaria prenatal adecuada, resulta difícil establecerlo. El conocer los antecedentes maternos de enfermedades gestacionales (AMEG): hipertensión arterial (HTA), hipotiroidismo, Diabetes Mellitus (DM) gestacional y otra; pudiera orientar a la diferenciación y el manejo. El objetivo de este trabajo fue determinar si la presencia de AMEG se asocia a complicaciones neonatales en productos de bajo peso neonatal. Métodos: Se realizó un estudio de cohorte retrospectivo en un grupo de 349 recién nacidos vivos de término (≥ 37 semanas de edad gestacional [SEG]), PEG, en cunero fisiológico y agrupados según los AMEG. Se determinó la frecuencia de dificultad respiratoria (DR), hipoglucemia (HG) e hiperbilirrubinemia (HBr). Resultados: El 16.6% (58/349) presentó AMEG (58.6% HTA y 41.3% hipotiroidismo, solos o combinados). Los neonatos con AMEG fueron más limítrofes (37 SEG, 55.2% vs. 35.1%; p = 0.037). Los de 37 SEG con menor peso (diferencia de ≈100 g; p = 0.028), más riesgo de HG (13.6%; intervalo de confianza al 95% [IC 95%]: −4.08-31.2) pero menos DR (diferencia de −4.7%; IC 95%: −20.6-11.05). La HG en los de 39 SEG solo se presentó en neonatos sin AMEG (diferencia 12.7%; IC 95%: 3.9 a 31.5) igual que la HBr (tres casos). Conclusiones: Indagar sobre los AMEG en un producto PEG parece ser útil en la inferencia de RCIU. Sin embargo, es insuficiente, por lo que en conjunto con otras herramientas nos ayuda a estimar posibles complicaciones y acciones preventivas.


Abstract Background: Low-birth-weight (LWB < 2.5 kg or <10 percentile) could be caused by constitutional matters or by intrauterine growth restriction (IUGR), both with different neonatal complications. Without an adequate prenatal evaluation is hard to stablish those conditions. Knowing the maternal history for gestational diseases (MHGD) such as hypertension (HTA), hypothyroidism or diabetes, among others could help clarify that difference. The aim of this work was to determine if having a MHGD is associated to neonatal complications in newborns with LWB. Methods: Retrospective cohort study, which included 349 with LWB at term (≥ 37 weeks of gestation [WG]) grouped into those with or without MHGD at a hospital nursery. The frequency of respiratory distress, hypoglycemia, and hyperbilirubinemia was determined. Results: 16.6% (58/349) had MHGD (58.6% for HTA and 41.3% hypothyroidism alone or combined). The neonate with MHGD were more borderline term (37 WGA, 55.2% vs. 35.1%; p = 0.037), and had lower weight (difference of ≈100 g; p = 0.028), had more cases with hypoglycemia (13.6%; CI 95%: −4.08 to 31.2%) but developed less respiratory distress (RD) (difference of −4.7%; CI 95%: −20.6 to 11.05%). Hypoglycemia in 39 WGA was only seen among neonates without MHGD (difference 12.7%; CI95%: 3.9 to 31.5%) just as for the hyperbilirubinemia cases (three). Conclusions: Inquiring about the MHGD on LBW term babies could be useful in the inference of IUGR, although we need other tools so that altogether can help to predict possible complications and to plan preventive actions.


Assuntos
Adolescente , Adulto , Feminino , Humanos , Recém-Nascido , Masculino , Pessoa de Meia-Idade , Gravidez , Adulto Jovem , Complicações na Gravidez/epidemiologia , Síndrome do Desconforto Respiratório do Recém-Nascido/epidemiologia , Retardo do Crescimento Fetal/epidemiologia , Hiperbilirrubinemia/epidemiologia , Hipoglicemia/epidemiologia , Complicações na Gravidez/fisiopatologia , Recém-Nascido Pequeno para a Idade Gestacional , Estudos Retrospectivos , Fatores de Risco , Estudos de Coortes
18.
Rev. colomb. biotecnol ; 18(2): 56-65, jul.-dic. 2016. ilus, tab
Artigo em Espanhol | LILACS | ID: biblio-959840

RESUMO

El maracuyá amarillo es un cultivo de importancia económica para el Valle del Cauca, pero en los últimos años ha presentado una reducción de hasta un 80% en la producción debido a problemas virales. El objetivo del presente trabajo fue detectar y caracterizar parcialmente begomovirus que podrían estar afectando los cultivos de maracuyá amarillo localizados en dos zonas productoras del Valle del Cauca (La Unión y Palmira). Se colectaron hojas de maracuyá con síntomas típicos de enfermedad viral, se purificó su DNA genómico y se detectó la presencia de begomovirus bipartitas mediante PCR empleando cebadores específicos para el componente A y B, respectivamente. Cinco fragmentos de DNA correspondientes al genoma geminiviral A y B, fueron clonados, secuenciados y analizados con herramientas bioinformáticas. Los resultados evidencian por primera vez en Colombia de la presencia de un begomovirus en maracuyá amarillo. El análisis de la secuencias de nucleótidos indica que este begomovirus está más relacionado con el virus del mosaico enano del frijol, un geminivirus que afecta frijol en Colombia, y no con el virus de la distorsión severa de la hoja de maracuyá, el cual se reportó afectando maracuyá amarillo en Brasil. A la fecha, este resultado constituiría el primer reporte de un begomovirus (perteneciente a la familia Geminiviridae) que afecta maracuyá amarillo en Colombia y que podría ser diferente de otros begomovirus previamente reportados a nivel mundial afectando este cultivo.


The yellow passion fruit is a crop of economic importance to the Valle del Cauca, but in recent years has been a reduction of up to 80% in production due to viral problems. The aim of this study was to detect and characterize partially begomovirus that could be affecting crops of yellow passionfruit located in two growing areas of the Valle del Cauca (La Union and Palmira). Passionfruit leaves with typical symptoms of viral disease were collected, purified genomic DNA and its bipartite begomovirus were detected by PCR using primers specific for component A and B, respectively. Five DNA fragments corresponding to geminiviral A and B genome were cloned, sequenced and analyzed with bioinformatics tools. The results show for the first time in Colombia the presence of a begomovirus in yellow passionfruit. The analysis of the nucleotide sequences indicates that this begomovirus is more related to bean BDMV, a geminivirus affecting beans in Colombia, not PSLDV, which was reported affecting yellow passionfruit in Brazil. To date, this result would be the first report of a begomovirus (belonging to the family Geminiviridae) affecting yellow passion fruit in Colombia, and that might be different from other begomovirus previously reported worldwide affecting this crop.

19.
Asian Pac J Cancer Prev ; 17(5): 2519-25, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27268623

RESUMO

There are several existing reports of microarray chip use for assessment of altered gene expression in different diseases. In fact, there have been over 1.5 million assays of this kind performed over the last twenty years, which have influenced clinical and translational research studies. The most commonly used DNA microarray platforms are Affymetrix GeneChip and Quality Control Software along with their GeneChip Probe Arrays. These chips are created using several quality controls to confirm the success of each assay, but their actual impact on gene expression profiles had not been previously analyzed until the appearance of several bioinformatics tools for this purpose. We here performed a data mining analysis, in this case specifically focused on ovarian cancer, as well as healthy ovarian tissue and ovarian cell lines, in order to confirm quality control results and associated variation in gene expression profiles. The microarray data used in our research were downloaded from ArrayExpress and Gene Expression Omnibus (GEO) and analyzed with Expression Console Software using RMA, MAS5 and Plier algorithms. The gene expression profiles were obtained using Partek Genomics Suite v6.6 and data were visualized using principal component analysis, heat map, and Venn diagrams. Microarray quality control analysis showed that roughly 40% of the microarray files were false negative, demonstrating over- and under-estimation of expressed genes. Additionally, we confirmed the results performing second analysis using independent samples. About 70% of the significant expressed genes were correlated in both analyses. These results demonstrate the importance of appropriate microarray processing to obtain a reliable gene expression profile.


Assuntos
Algoritmos , Biomarcadores Tumorais/genética , Perfilação da Expressão Gênica/métodos , Perfilação da Expressão Gênica/normas , Análise de Sequência com Séries de Oligonucleotídeos/normas , Neoplasias Ovarianas/genética , Controle de Qualidade , Biologia Computacional/normas , Bases de Dados Genéticas , Feminino , Humanos , Software , Transcriptoma
20.
Biomédica (Bogotá) ; 36(supl.1): 45-50, abr. 2016. mapas, tab
Artigo em Espanhol | LILACS | ID: lil-783521

RESUMO

Introducción. Rickettsia typhi es la bacteria causante del tifus múrido o endémico, el cual es transmitido al ser humano principalmente por medio de las heces infectadas de pulgas y en cuyo ciclo de infección se encuentran involucrados distintos animales sinantrópicos y domésticos. En la comunidad rural de Bolmay, Yucatán, México, se reportaron casos de tifus múrido en seres humanos durante el periodo 2007-2010. Objetivo. Identificar la presencia de R . typhi y estimar la frecuencia de infección en perros de Bolmay, México. Materiales y métodos. Se tomaron muestras de sangre completa de 128 perros, se les extrajo el ADN total y se analizaron mediante reacción en cadena de la polimerasa (PCR) para amplificar los fragmentos del gen de 17 kDa y omp B , y confirmar la presencia de Rickettsia spp. Los productos de las reacciones se enviaron a secuenciación y se les hizo un análisis de alineamiento con Basic Local Alignment Search Tool (BLAST). Resultados. Se encontró una frecuencia de infección de 5,5 % (7/128). El alineamiento demostró 99 % de homologación para el gen de 17 kDa y 100 % para el gen omp B en R . typhi . Conclusión. Se detectó la presencia de R . typhi pero una baja frecuencia de infección en perros de la comunidad de estudio; sin embargo, la especie podría representar un riesgo de transmisión para los seres humanos.


Introduction: Rickettsia typhi causes murine or endemic typhus, which is transmitted to humans primarily through flea bites contaminated with feces. Synanthropic and domestic animals also contribute to the infection cycle of R. typhi . Cases of murine typhus in humans were reported in the rural community of Bolmay, Yucatán, México, between 2007 and 2010. Objective: To identify the presence of R . typhi and estimate the frequency of infection in dogs from Bolmay, México, a locality with previous reports of murine typhus in humans. Materials and methods: Whole blood samples were taken from 128 dogs. Total DNA was extracted for use in the polymerase chain reaction (PCR) to amplify fragments of the 17 kDa and omp B genes and confirms the presence of Rickettsia spp. The reaction products were sequenced, and alignment analysis was performed using the BLAST tool. Results: The frequency of R. typhi infection in dogs was 5.5 % (7/128). The alignment identified 99% and 100% homology to the R . typhi 17 kDa and omp B genes, respectively. Conclusion: We confirmed the presence of R . typhi in dogs in the studied community but at a low frequency. However, there is potential risk of transmission to humans.


Assuntos
Rickettsia typhi , Cães , México
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