RESUMEN
BACKGROUND: Efforts on a global scale for combating malaria have achieved substantial progress over the past twenty years. Two Central American nations have accomplished their goal of eliminating malaria: El Salvador and Belize. Honduras has decreased the incidence of malaria and now reports fewer than 4000 malaria cases annually, aspiring to reach elimination by 2030. To accomplish this goal, it is essential to assess the existing strategies employed for malaria control and to address the task of incorporating novel intervention strategies to identify asymptomatic reservoirs. METHODS: A survey for detecting asymptomatic cases was carried out in the community of Kaukira, in Gracias a Dios, Honduras, focusing on malaria transmission during 2023. Asymptomatic community members were recruited as participants, malaria screening was performed through a rapid diagnostic test in situ, and a blood sample was collected on filter paper. Highly sensitive molecular assays based on photo-induced electron transfer PCR (PET-PCR) were performed to detect the two species of Plasmodium circulating in Honduras: Plasmodium vivax and Plasmodium falciparum. In addition, the identification of the parasite species was verified by amplifying three genetic markers (Pvmsp3α, Pvmsp3ß, and Pfmsp1). RESULTS: A total of 138 participants were recruited, mostly adult women. All individuals tested negative on the rapid diagnostic test. Positive results for malaria were detected by PET-PCR in 17 samples (12.3%). Most samples (12 out of 17) were amplified with a Ct value between 37 and 42, indicating very low parasitemias. Out of the 17 samples, 16 of them also showed amplification in the species assays. There were nine cases of P. falciparum infections and seven cases of P. vivax infections that were further confirmed by nested PCR (nPCR) of Pvmsp3 and Pfmsp1. Parasitemias ranged from 100 p/µL to less than 0.25 p/µL. One sample showed mixed infection. CONCLUSIONS: The existence of asymptomatic malaria reservoirs in Honduras can contribute to disease transmission and pose a challenge that may hinder elimination efforts, requiring public health authorities to modify surveillance strategies to identify the disease and treat this population accordingly.
RESUMEN
Background: Previous studies reported the negative impact of social isolation on mental health in people with dementia (PwD) and their caregivers, butlongitudinal studies seem scarcer. Objective: To describe a one-year follow-up impact of the COVID-19 pandemic on PwD and their caregivers in both Brazil and Chile. Methods: This study analyzed the impact of the pandemic on the psychological and physical health of PwD and their family caregivers after one year of follow-up in three outpatient clinics in Brazil (nâ=â68) and Chile (nâ=â61). Results: In both countries, PwD reduced their functional capacity after one year of follow-up (pâ=â0.017 and pâ=â0.009; respectively) and caregivers reported worse physical and mental health (pâ=â0.028 and pâ=â0.039). Only in Chile, caregivers reported more sadness associated with care (pâ=â0.001), and reduced time sleeping (pâ=â0.07). Conclusions: In conclusion, the COVID-19 pandemic appears to have had a long-lasting impact on PwD and their caregivers. However, it is essential to acknowledge that the inherent progression of dementia itself may also influence changes observed over a year.
Asunto(s)
COVID-19 , Demencia , Humanos , Cuidadores/psicología , Pandemias , Salud Mental , Demencia/epidemiología , Demencia/psicología , Estudios de Seguimiento , Chile/epidemiología , Brasil/epidemiología , COVID-19/epidemiologíaRESUMEN
ANTECEDENTES Y OBJETIVO: La soledad es un factor de riesgo para el desarrollo de enfermedades físicas y mentales, causando disminución en la calidad de vida y un aumento de la mortalidad. El objetivo de este artículo fue determinar los factores predictores de soledad en personas cuidadoras informales de personas con demencia dentro de un contexto de crisis como fue la pandemia por COVID-19 con el fin de identificar e intervenir en dichos factores desde la atención primaria de salud. DISEÑO Y METODOLOGÍA: Este es un estudio cuantitativo de carácter transversal para el cual se realizó un muestreo de conveniencia no probabilístico. Ciento noventa y cinco personas cuidadores informales, por medio de una encuesta en línea, respondieron preguntas sociodemográficas y clínicas sobre ellos mismos (soledad, síntomas ansiosos y depresivos, actividades físicas y mentales, sobrecarga y apoyo psicosocial) y sobre la persona con demencia (cambios en la memoria y en los síntomas conductuales y psicológicos). Los datos fueron recolectados durante 6 meses y se hicieron análisis descriptivos, de correlación y de regresión. RESULTADOS: La baja escolaridad, disminución del ingreso económico, no mantener durante la pandemia las actividades físicas y mentales y la sobrecarga en el cuidador se relacionaron significativamente con mayor soledad, mientras que los factores predictores de la misma fueron la presencia de sintomatología ansiosa depresiva, la baja percepción de apoyo psicosocial y la convivencia de la persona cuidadora con la persona con demencia. CONCLUSIÓN: El riesgo de desarrollar soledad en los cuidadores informales de personas con demencia es alto. Los profesionales de enfermería, particularmente en atención primaria, deben estar alertas a identificar a aquellos cuidadores que conviven con la persona con demencia, que presentan síntomas ansiosos y depresivos y que reportan una baja percepción de apoyo psicosocial dado que son más vulnerables de experimentar soledad percibida.
BACKGROUND AND OBJECTIVE: Loneliness is a risk factor for the development of physical and mental illness, causing decreased quality of life and increased mortality. The aim of this article was to recognise predictors of loneliness in informal caregivers of people with dementia in the context of a crisis such as the COVID-19 pandemic. DESIGN AND METHODOLOGY: 195 informal caregivers, through an online survey, answered sociodemographic and clinical questions about themselves (loneliness, anxious and depressive symptoms, physical and mental activities, overload and psychosocial support) and about the person with dementia (changes in memory and behavioural and psychological symptoms). RESULTS: Low schooling, decreased income, failure to maintain physical and mental activities during the pandemic and caregiver overload were significantly related to increased loneliness, while predictors of loneliness were the presence of depressive anxiety symptoms, low perception of psychosocial support and the caregiver living with the person with dementia. CONCLUSION: The risk of developing loneliness in caregivers of people with dementia is high. Nursing professionals, particularly in primary care, should be on the alert for those caregivers within this group who live with the person with dementia, who present anxious and depressive symptoms and who report a low perception of psychosocial support, as they are more vulnerable to experiencing perceived loneliness.
RESUMEN
BACKGROUND: Malaria remains a main parasitic disease of humans. Although the largest number of cases is reported in the African region, there are still endemic foci in the Americas. Central America reported 36,000 malaria cases in 2020, which represents 5.5% of cases in the Americas and 0.015% of cases globally. Most malaria infections in Central America are reported in La Moskitia, shared by Honduras and Nicaragua. In the Honduran Moskitia, less than 800 cases were registered in 2020, considering it an area of low endemicity. In low endemicity settings, the number of submicroscopic and asymptomatic infections tends to increase, leaving many cases undetected and untreated. These reservoirs challenge national malaria elimination programmes. This study aimed to assess the diagnostic performance of Light Microscopy (LM), a nested PCR test and a photoinduced electron transfer polymerase chain reaction (PET-PCR) in a population of febrile patients from La Moskitia. METHODS: A total of 309 febrile participants were recruited using a passive surveillance approach at the Puerto Lempira hospital. Blood samples were analysed by LM, nested PCR, and PET-PCR. Diagnostic performance including sensitivity, specificity, negative and positive predictive values, kappa index, accuracy, and ROC analysis was evaluated. The parasitaemia of the positive samples was quantified by both LM and PET-PCR. RESULTS: The overall prevalence of malaria was 19.1% by LM, 27.8% by nPCR, and 31.1% by PET-PCR. The sensitivity of LM was 67.4% compared to nPCR, and the sensitivity of LM and nPCR was 59.6% and 80.8%, respectively, compared to PET-PCR. LM showed a kappa index of 0.67, with a moderate level of agreement. Forty positive cases by PET-PCR were not detected by LM. CONCLUSIONS: This study demonstrated that LM is unable to detect parasitaemia at low levels and that there is a high degree of submicroscopic infections in the Honduran Moskitia.
Asunto(s)
Malaria Falciparum , Malaria , Humanos , Malaria/epidemiología , Malaria/diagnóstico , Reacción en Cadena de la Polimerasa , Técnicas de Amplificación de Ácido Nucleico , Parasitemia/epidemiología , Tomografía de Emisión de Positrones , Malaria Falciparum/parasitología , Sensibilidad y Especificidad , Plasmodium falciparum/genéticaRESUMEN
The elimination of malaria requires strengthening diagnosis and offering adequate and timely treatment. Imported cases of falciparum malaria represent a major challenge for pre-elimination areas, such as Central America, where chloroquine and primaquine continue to be used as first-line treatment. The pfs47 gene has been previously described as a precise molecular marker to track the geographic origin of the parasite. The aim of this study was to design a simple and low-cost technique using the polymorphic region of pfs47 to assess the geographic origin of P. falciparum strains. A PCR-RFLP technique was developed and evaluated using the MseI enzyme that proved capable of discriminating, with reasonable precision, the geographical origin of the parasites. This method could be used by national surveillance laboratories and malaria elimination programs in countries such as Honduras and Nicaragua in cases of malaria where an origin outside the Central American isthmus is suspected.
RESUMEN
The diagnosis of malaria in Honduras is based mainly on microscopic observation of the parasite in thick smears or the detection of parasite antigens through rapid diagnostic tests when microscopy is not available. The specific treatment of the disease depends exclusively on the positive result of one of these tests. Given the low sensitivity of conventional methods, new diagnostic approaches are needed. This study evaluates the in-field performance of a device (Gazelle™) based on the detection of hemozoin. This was a double-blind study evaluating symptomatic individuals with suspected malaria in the department of Gracias a Dios, Honduras, using blood samples collected from 2021 to 2022. The diagnostic performance of Gazelle™ was compared with microscopy and nested 18ssr PCR as references. The sensitivity and specificity of Gazelle™ were 59.7% and 98.6%, respectively, while microscopy had a sensitivity of 64.9% and a specificity of 100%. The kappa index between microscopy and Gazelle™ was 0.9216 using microscopy as a reference. Both methods show similar effectiveness and predictive values. No statistical differences were observed between the results of the Gazelle™ compared to light microscopy (p = 0.6831). The turnaround time was shorter for Gazelle™ than for microscopy, but the cost per sample was slightly higher for Gazelle™. Gazelle™ showed more false-negative cases when infections were caused by Plasmodium falciparum compared to P. vivax. Conclusions: The sensitivity and specificity of Gazelle™ are comparable to microscopy. The simplicity and ease of use of the Gazelle™, the ability to run on batteries, and the immediacy of its results make it a valuable tool for malaria detection in the field. However, further development is required to differentiate Plasmodium species, especially in those regions requiring differentiated treatment.
RESUMEN
BACKGROUND: Central America and the island of Hispaniola have set out to eliminate malaria by 2030. However, since 2014 a notable upturn in the number of cases has been reported in the Mosquitia region shared by Nicaragua and Honduras. In addition, the proportion of Plasmodium falciparum malaria cases has increased significantly relative to vivax malaria. Chloroquine continues to be the first-line drug to treat uncomplicated malaria in the region. The objective of this study was to evaluate the emergence of chloroquine resistant strains of P. falciparum using a genetic approach. Plasmodium vivax populations are not analysed in this study. METHODS: 205 blood samples from patients infected with P. falciparum between 2018 and 2021 were analysed. The pfcrt gene fragment encompassing codons 72-76 was analysed. Likewise, three fragments of the pfmdr1 gene were analysed in 51 samples by nested PCR and sequencing. RESULTS: All samples revealed the CVMNK wild phenotype for the pfcrt gene and the N86, Y184F, S1034C, N1042D, D1246 phenotype for the pfmdr1 gene. CONCLUSIONS: The increase in falciparum malaria cases in Nicaragua and Honduras cannot be attributed to the emergence of chloroquine-resistant mutants. Other possibilities should be investigated further. This is the first study to report the genotype of pfmdr1 for five loci of interest in Central America.
Asunto(s)
Antimaláricos/farmacología , Resistencia a Medicamentos/genética , Proteínas de Transporte de Membrana/genética , Proteínas Asociadas a Resistencia a Múltiples Medicamentos/genética , Plasmodium falciparum/genética , Proteínas Protozoarias/genética , Marcadores Genéticos , Honduras , Malaria Falciparum/parasitología , Proteínas de Transporte de Membrana/metabolismo , Proteínas Asociadas a Resistencia a Múltiples Medicamentos/metabolismo , Nicaragua , Plasmodium falciparum/metabolismo , Proteínas Protozoarias/metabolismoRESUMEN
The countries of Central America and the island of Hispaniola have set the goal of eliminating malaria in less than a decade. Although efforts to reduce the malaria burden in the region have been successful, there has been an alarming increase in cases in the Nicaraguan Moskitia since 2014. The continuous decrease in cases between 2000 and 2014, followed by a rapid expansion from 2015 to the present, has generated a potential bottleneck effect in the populations of Plasmodium spp. Consequently, this study aimed to evaluate the genetic diversity of P. falciparum and the decrease in allelic richness in this population. The polymorphic regions of the pfmsp-1 and pfmsp-2 genes of patients with falciparum malaria from Honduras and Nicaragua were analyzed using nested PCR and sequencing. Most of the samples were classified into the K1 allelic subfamily of the pfmsp-1 gene and into the 3D7 subfamily of the pfmsp-2 gene. Despite the low genetic diversity found, more than half of the samples presented a polyclonal K1/RO33 haplotype. No sequence polymorphisms were found within each allelic subfamily. This study describes a notable decrease in the genetic diversity of P. falciparum in the Moskitia region after a bottleneck phenomenon. These results will be useful for future epidemiological investigations and the monitoring of malaria transmission in Central America.
RESUMEN
BACKGROUND: People with dementia and their family caregivers may face a great burden through social isolation due to the COVID-19 pandemic, which can be manifested as various behavioral and clinical symptoms. OBJECTIVE: To investigate the impacts of social isolation due to the COVID-19 pandemic on individuals with dementia and their family caregivers. METHODS: Two semi-structured questionnaires were applied via telephone to family caregivers of people diagnosed with dementia in three cities in Argentina, Brazil, and Chile, in order to assess clinical and behavioral changes in people with dementia and in their caregivers. RESULTS: In general, 321 interviews were conducted. A significant decline in memory function has been reported among 53.0%of people with dementia. In addition, 31.2%of individuals with dementia felt sadder and 37.4%had increased anxiety symptoms. These symptoms of anxiety were greater in individuals with mild to moderate dementia, while symptoms of agitation were greater in individuals with severe dementia. Moreover, compulsive-obsessive behavior, hallucinations, increased forgetfulness, altered appetite, and increased difficulty in activities of daily living were reported more frequently among individuals with moderate to severe dementia. Caregivers reported feeling more tired and overwhelmed during this period and these symptoms were also influenced by the severity of dementia. CONCLUSION: Social isolation during the COVID-19 pandemic triggered a series of negative behavioral repercussions, both for people with dementia and for their family caregivers in these three South American countries.
Asunto(s)
COVID-19/psicología , Cuidadores/psicología , Demencia/psicología , Distanciamiento Físico , Aislamiento Social/psicología , Actividades Cotidianas , Adulto , Anciano , Anciano de 80 o más Años , Argentina , Brasil , Chile , Femenino , Humanos , Masculino , Persona de Mediana Edad , Pandemias , Encuestas y CuestionariosRESUMEN
BACKGROUND: Malaria is an important disease in many tropical countries. Rapid diagnostic tests (RDTs) are valuable tools for diagnosing malaria in remote areas. The majority of RDTs used for the diagnosis of Plasmodium falciparum are based on the detection of the specific histidine-rich proteins (PfHRP2 and PfHRP3). During the last decade, the threat posed by the lack of expression of these antigens and the variability of the proteins on the diagnosis of malaria has been widely discussed. The aim of this study was to evaluate the genetic diversity of pfhrp2 and pfhrp3 of P. falciparum isolates collected in three Central American countries. METHODS: DNA samples were amplified and sequenced to assess the diversity of nucleotides and amino acids. A search for known epitopes within the amino acid sequence was carried out, and the sensitivity of the sequences was evaluated according to a predictive model. A phylogenetic analysis was carried out including homologous sequences from different regions of the world. Protein structures were predicted in silico. RESULTS: Five different patterns for PfHRP2 and one pattern for PfHRP3 were identified. Isolates from Central America show a high level of genetic diversity in pfhrp2; however, the amino acid sequences seem to contain enough motifs to be detected by the RDTs currently available. CONCLUSION: It is unlikely that the variability of the pfhrp2 and pfhrp3 genes has a significant impact on the ability of the RDTs to detect the PfHRP antigens in Central America.
Asunto(s)
Antígenos de Protozoos/genética , Variación Genética , Plasmodium falciparum/genética , Proteínas Protozoarias/genética , Antígenos de Protozoos/química , Pruebas Diagnósticas de Rutina , Guatemala , Honduras , Nicaragua , Filogenia , Estructura Terciaria de Proteína , Proteínas Protozoarias/químicaRESUMEN
BACKGROUND: The incidence of malaria in the Americas has decreased markedly in recent years. Honduras and the other countries of Mesoamerica and the island of Hispaniola have set the goal of eliminating native malaria by the year 2020. To achieve this goal, Honduras has recently approved national regulations to expand the possibilities of a shortened double dose primaquine (PQ) treatment for vivax malaria. Considering this new shortened anti-malarial treatment, the high frequency of G6PDd genotypes in Honduras, and the lack of routinely assessment of the G6PD deficiency status, this study aimed at investigating the potential association between the intake of PQ and haemolysis in malaria-infected G6PDd subjects. METHODS: This was a prospective cohort and open-label study. Participants with malaria were recruited. Plasmodium vivax infection was treated with 0.25 mg/kg of PQ daily for 14 days. Safety and signs of haemolysis were evaluated by clinical criteria and laboratory values before and during the 3rd and 7th day of PQ treatment. G6PD status was assessed by a rapid test (CareStart™) and two molecular approaches. RESULTS: Overall 55 participants were enrolled. The frequency of G6PD deficient genotypes was 7/55 (12.7%), where 5/7 (71.4%) were hemizygous A- males and 2/7 (28.6%) heterozygous A- females. Haemoglobin concentrations were compared between G6PD wild type (B) and G6PDd A- subjects, showing a significant difference between the means of both groups in the 3rd and 7th days. Furthermore, a statistically significant difference was evident in the change in haemoglobin concentration between the 3rd day and the 1st day for both genotypes, but there was no statistical difference for the change in haemoglobin concentration between the 7th day and the 1st day. Besides these changes in the haemoglobin concentrations, none of the patients showed signs or symptoms associated with severe haemolysis, and none needed to be admitted to a hospital for further medical attention. CONCLUSIONS: The findings support that the intake of PQ during 14 days of treatment against vivax malaria is safe in patients with a class III variant of G6PDd. In view of the new national regulations in the shortened treatment of vivax malaria for 7 days, it is advisable to be alert of potential cases of severe haemolysis that could occur among G6PD deficient hemizygous males with a class II mutation such as the Santamaria variant, previously reported in the country.
Asunto(s)
Antimaláricos/uso terapéutico , Deficiencia de Glucosafosfato Deshidrogenasa/fisiopatología , Hemólisis , Malaria Falciparum/parasitología , Malaria Vivax/parasitología , Primaquina/uso terapéutico , Adolescente , Adulto , Anciano , Niño , Femenino , Honduras , Humanos , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Riesgo , Adulto JovenRESUMEN
BACKGROUND: Malaria remains a public health problem in some countries of Central America. Rapid diagnostic tests (RDTs) are one of the most useful tools to assist in the diagnosis of malaria in remote areas. Since its introduction, a wide variety of RDTs have been developed for the detection of different parasite antigens. PfHRP2 is the most targeted antigen for the detection of Plasmodium falciparum infections. Genetic mutations and gene deletions are important factors influencing or affecting the performance of rapid diagnostic tests. METHODS: In order to demonstrate the presence or absence of the pfhrp2 and pfhrp3 genes and their flanking regions, a total of 128 blood samples from patients with P. falciparum infection from three Central American countries were analysed through nested or semi-nested PCR approaches. RESULTS: In total, 25.8 and 91.4% of the isolates lacked the region located between exon 1 and exon 2 of pfhrp2 and pfhrp3 genes, respectively. Parasites from the three countries showed deletions of one or both genes. The highest proportion of pfhrp2 deletions was found in Nicaragua while the isolates from Guatemala revealed the lowest number of pfhrp2 deletions. Parasites collected from Honduras showed the highest proportion of phfrp3 absence (96.2%). Twenty-one percent of isolates were double negative mutants for the exon 1-2 segment of both genes, and 6.3% of isolates lacked the full-length coding region of both genes. CONCLUSIONS: This study provides molecular evidence of the existence of P. falciparum isolates lacking the pfhrp2 and pfhrp3 genes, and their flanking regions, in Honduras, Guatemala and Nicaragua. This finding could hinder progress in the control and elimination of malaria in Central America. Continuous evaluation of RDTs and molecular surveillance would be recommended.
Asunto(s)
Antígenos de Protozoos/genética , Secuencia de Bases , Plasmodium falciparum/genética , Proteínas Protozoarias/genética , Eliminación de Secuencia , ADN Intergénico , Guatemala , Honduras , Humanos , NicaraguaRESUMEN
Para conmemorar los quince años de MedUNAB el comité estudiantil quiso escribir sobre el significado que tiene para cada uno de sus miembros pertenecer a ella. Es así como en este editorial recogemos las distintas experiencias que se han tenido, algunas de años, otras de meses.
To commemorate the fifteenth anniversary of MedUNAB, the student committee wanted to write about the meaning of belonging to the journals. That is how in this editorial we collect the different experiences that have been had, some of years, others of month