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1.
Emerg Infect Dis ; 27(4): 1077-1086, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33539721

RESUMEN

Pneumonia caused by severe acute respiratory syndrome coronavirus 2 emerged in China at the end of 2019. Because of the severe immunomodulation and lymphocyte depletion caused by this virus and the subsequent administration of drugs directed at the immune system, we anticipated that patients might experience fungal superinfection. We collected data from 186 patients who had coronavirus disease-associated pulmonary aspergillosis (CAPA) worldwide during March-August 2020. Overall, 182 patients were admitted to the intensive care unit (ICU), including 180 with acute respiratory distress syndrome and 175 who received mechanical ventilation. CAPA was diagnosed a median of 10 days after coronavirus disease diagnosis. Aspergillus fumigatus was identified in 80.3% of patient cultures, 4 of which were azole-resistant. Most (52.7%) patients received voriconazole. In total, 52.2% of patients died; of the deaths, 33.0% were attributed to CAPA. We found that the cumulative incidence of CAPA in the ICU ranged from 1.0% to 39.1%.


Asunto(s)
Aspergillus fumigatus/aislamiento & purificación , COVID-19 , Unidades de Cuidados Intensivos/estadística & datos numéricos , Aspergilosis Pulmonar , Voriconazol/uso terapéutico , Anciano , Antifúngicos/uso terapéutico , COVID-19/complicaciones , COVID-19/inmunología , COVID-19/mortalidad , COVID-19/terapia , Femenino , Humanos , Factores Inmunológicos/administración & dosificación , Factores Inmunológicos/efectos adversos , Incidencia , Cooperación Internacional , Masculino , Evaluación de Procesos y Resultados en Atención de Salud , Aspergilosis Pulmonar/diagnóstico , Aspergilosis Pulmonar/tratamiento farmacológico , Aspergilosis Pulmonar/mortalidad , Sistema de Registros , Respiración Artificial/métodos , Factores de Riesgo , SARS-CoV-2/aislamiento & purificación
2.
Med Mycol ; 58(8): 1126-1137, 2020 Nov 10.
Artículo en Inglés | MEDLINE | ID: mdl-32343345

RESUMEN

Among Cryptococcus gattii genotypes, VGII has gained pivotal relevance in epidemiological, clinical and genetic contexts due to its association with several outbreaks in temperate regions and due to the high variability of this genotype. The aim of this study was to compare 25 isolates of C. gattii from the Southeast region of Brazil with previously described isolates from other regions of the country and around the world. Among the 25 isolates, 24 were VGII and one was VGI. All of them were newly identified. Three new allele types (AT) (AT47 for the URA5 locus, AT56 for the LAC1 locus, and AT96 for the IGS1 region) were also described. Compared with other Brazilian isolates, those from the Southeast region presented the greatest haplotype diversity. In general, the regions presented different sequence types (STs), and only nine STs were found in more than one location. GoeBURST analysis showed two large groups among the Brazilian isolates. The largest group consists of 59 STs predominantly from the North and Northeast regions; the other large group includes 57 STs from the Southeast and Midwest regions. In a global context the South American isolates presented the highest genetic diversity (STs = 145, haplotype diversity (Hd) = 0.999 and π = 0.00464), while the African populations showed the lowest genetic diversity (STs = 3, Hd = 0.667 and π = 0.00225). These results confirm that the Brazilian C. gattii VGII population is highly diverse and reinforce the hypothesis of dispersion of this genotype from South America.


Asunto(s)
Criptococosis/microbiología , Cryptococcus gattii/genética , Microbiología Ambiental , Animales , Brasil/epidemiología , Criptococosis/epidemiología , Cryptococcus gattii/clasificación , Cryptococcus gattii/aislamiento & purificación , Variación Genética , Genética de Población , Genotipo , Humanos , Filogenia
3.
Fungal Genet Biol ; 129: 16-29, 2019 08.
Artículo en Inglés | MEDLINE | ID: mdl-30953839

RESUMEN

A total of 476 European isolates (310 Cryptococcus neoformans var. grubii, 150 C. neoformans var. neoformans, and 16 C. gattii species complex) from both clinical and environmental sources were analyzed by multi-locus sequence typing. Phylogenetic and population genetic analyses were performed. Sequence analysis identified 74 sequence types among C. neoformans var. neoformans (VNIV), 65 among C. neoformans var. grubii (56 VNI, 8 VNII, 1 VNB), and 5 among the C. gattii species complex (4 VGI and 1 VGIV) isolates. ST23 was the most frequent genotype (22%) among VNI isolates which were mostly grouped in a large clonal cluster including 50% of isolates. Among VNIV isolates, a predominant genotype was not identified. A high percentage of autochthonous STs were identified in both VNI (71%) and VNIV (96%) group of isolates. The 16 European C. gattii species complex isolates analyzed in the present study originated all from the environment and all belonged to a large cluster endemic in the Mediterranean area. Population genetic analysis confirmed that VNI group of isolates were characterized by low variability and clonal expansion while VNIV by a higher variability and a number of recombination events. However, when VNI and VNIV environmental isolates were compared, they showed a similar population structure with a high percentage of shared mutations and the absence of fixed mutations. Also linkage disequilibrium analysis reveals differences between clinical and environmental isolates showing a key role of PLB1 allele combinations in host infection as well as the key role of LAC1 allele combinations for survival of the fungus in the environment. The present study shows that genetic comparison of clinical and environmental isolates represents a first step to understand the genetic characteristics that cause the shift of some genotypes from a saprophytic to a parasitic life style.


Asunto(s)
Cryptococcus gattii/genética , Cryptococcus neoformans/genética , Genotipo , Filogenia , Animales , Microbiología Ambiental , Europa (Continente) , Genética de Población , Humanos , Región Mediterránea , Tipificación de Secuencias Multilocus , Técnicas de Tipificación Micológica
4.
Environ Microbiol ; 19(10): 4318-4325, 2017 10.
Artículo en Inglés | MEDLINE | ID: mdl-28892309

RESUMEN

Fundamental niche prediction of Cryptococcus neoformans and Cryptococcus gattii in Europe is an important tool to understand where these pathogenic yeasts have a high probability to survive in the environment and therefore to identify the areas with high risk of infection. In this study, occurrence data for C. neoformans and C. gattii were compared by MaxEnt software with several bioclimatic conditions as well as with soil characteristics and land use. The results showed that C. gattii distribution can be predicted with high probability along the Mediterranean coast. The analysis of variables showed that its distribution is limited by low temperatures during the coldest season, and by heavy precipitations in the driest season. C. neoformans var. grubii is able to colonize the same areas of C. gattii but is more tolerant to cold winter temperatures and summer precipitations. In contrast, the C. neoformans var. neoformans map was completely different. The best conditions for its survival were displayed in sub-continental areas and not along the Mediterranean coasts. In conclusion, we produced for the first time detailed prediction maps of the species and varieties of the C. neoformans and C. gattii species complex in Europe and Mediterranean area.


Asunto(s)
Microambiente Celular/fisiología , Cryptococcus gattii/crecimiento & desarrollo , Cryptococcus neoformans/crecimiento & desarrollo , Microbiología Ambiental , Microbiología del Suelo , Criptococosis/microbiología , Cryptococcus gattii/metabolismo , Cryptococcus neoformans/metabolismo , Europa (Continente) , Región Mediterránea , Estaciones del Año , Suelo/química , Tiempo (Meteorología)
5.
FEMS Yeast Res ; 16(4)2016 06.
Artículo en Inglés | MEDLINE | ID: mdl-27188887

RESUMEN

In order to elucidate the distribution of Cryptococcus neoformans and C. gattii in the Mediterranean basin, an extensive environmental survey was carried out during 2012-2015. A total of 302 sites located in 12 countries were sampled, 6436 samples from 3765 trees were collected and 5% of trees were found to be colonized by cryptococcal yeasts. Cryptococcus neoformans was isolated from 177 trees and C. gattii from 13. Cryptococcus neoformans colonized 27% of Ceratonia, 10% of Olea, Platanus and Prunus trees and a lower percentage of other tree genera. The 13 C. gattii isolates were collected from five Eucalyptus, four Ceratonia, two Pinus and two Olea trees. Cryptococcus neoformans was distributed all around the Mediterranean basin, whereas C. gattii was isolated in Greece, Southern Italy and Spain, in agreement with previous findings from both clinical and environmental sources. Among C. neoformans isolates, VNI was the prevalent molecular type but VNII, VNIV and VNIII hybrid strains were also isolated. With the exception of a single VGIV isolate, all C. gattii isolates were VGI. The results confirmed the presence of both Cryptococcus species in the Mediterranean environment, and showed that both carob and olive trees represent an important niche for these yeasts.


Asunto(s)
Cryptococcus gattii/aislamiento & purificación , Cryptococcus neoformans/aislamiento & purificación , Microbiología Ambiental , Árboles/microbiología , Cryptococcus gattii/clasificación , Cryptococcus gattii/genética , Cryptococcus neoformans/clasificación , Cryptococcus neoformans/genética , Genotipo , Región Mediterránea , Tipificación Molecular , Técnicas de Tipificación Micológica
6.
Mycopathologia ; 180(5-6): 333-43, 2015 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-26138435

RESUMEN

The Candida parapsilosis complex has emerged as an important fungal pathogen. In spite of this, relatively little is known about its characteristics. Thus, the purposes of this study were (1) to determine by BanI-RFLP-assay the occurrence of C. parapsilosis complex species among 81 clinical isolates primarily identified as C. parapsilosis; (2) to evaluate their in vitro production of virulence factors; and (3) to compare their susceptibility profiles, grown as planktonic cells and biofilms, against amphotericin B, fluconazole, voriconazole, and caspofungin by following the Clinical and Laboratory Standards Institute (CLSI) guidelines. Seventy-seven isolates (95%) were identified as C. parapsilosis sensu stricto, 2 (2.5%) as C. orthopsilosis, and 2 (2.5%) as C. metapsilosis. Protease activity was detected in 29 (37.7%) isolates of C. parapsilosis sensu stricto, whereas only 7 (9.1%) exhibited phospholipase activity. None of the C. metapsilosis or C. orthopsilosis was able to produce protease or phospholipase. Biofilm production was detected in 35 (43.2%) isolates, among which 33 were C. parapsilosis sensu stricto and 2 were C. orthopsilosis. Antifungal resistance was uncommon; only one C. metapsilosis was fluconazole resistant. However, biofilm-producing isolates showed a marked resistance to all antifungal agents tested, particularly to voriconazole. This knowledge could be of clinical relevance for guiding therapeutic decisions.


Asunto(s)
Antifúngicos/farmacología , Candida/clasificación , Candida/efectos de los fármacos , Factores de Virulencia/análisis , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Biopelículas/crecimiento & desarrollo , Candida/aislamiento & purificación , Candida/fisiología , Niño , Preescolar , Femenino , Genotipo , Humanos , Hidrolasas/análisis , Lactante , Recién Nacido , Masculino , Pruebas de Sensibilidad Microbiana , Persona de Mediana Edad , Tipificación Molecular , Técnicas de Tipificación Micológica , Polimorfismo de Longitud del Fragmento de Restricción , Adulto Joven
7.
J Fungi (Basel) ; 10(1)2024 Jan 05.
Artículo en Inglés | MEDLINE | ID: mdl-38248954

RESUMEN

Histoplasmosis is a widespread systemic disease caused by Histoplasma capsulatum, prevalent in the Americas. Despite its significant morbidity and mortality rates, no vaccines are currently available. Previously, five vaccine targets and specific epitopes for H. capsulatum were identified. Immunoinformatics has emerged as a novel approach for determining the main immunogenic components of antigens through in silico methods. Therefore, we predicted the main helper and cytotoxic T lymphocytes and B-cell epitopes for these targets to create a potential multi-epitope vaccine known as HistoVAC-TSFM. A total of 38 epitopes were found: 23 common to CTL and B-cell responses, 11 linked to HTL and B cells, and 4 previously validated epitopes associated with the B subunit of cholera toxin, a potent adjuvant. In silico evaluations confirmed the stability, non-toxicity, non-allergenicity, and non-homology of these vaccines with the host. Notably, the vaccine exhibited the potential to trigger both innate and adaptive immune responses, likely involving the TLR4 pathway, as supported by 3D modeling and molecular docking. The designed HistoVAC-TSFM appears promising against Histoplasma, with the ability to induce important cytokines, such as IFN-γ, TNF-α, IL17, and IL6. Future studies could be carried out to test the vaccine's efficacy in in vivo models.

8.
Med Mycol ; 51(6): 635-40, 2013 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-23343452

RESUMEN

Cryptococcus neoformans and C. gattii are the etiologic agents of cryptococcosis, a life-threatening disease in both immunocompromised and immunocompetent hosts. Antifungal resistance has been evaluated using different methods, breakpoints, and sizes of test populations and it is an emerging as a significant issue worldwide. A total of 176 (95 clinical and 81 environmental) C. neoformans and eight clinical C. gattii isolates were evaluated to determine the minimal inhibitory concentration (MIC) according to the Clinical and Laboratory Standards Institute method. A total of 10.5% of the C. neoformans clinical isolates were resistant to amphotericin B (AMB), and 6.2% of the environmental isolates were resistant to fluconazole (FLZ). Environmental and clinical isolates presented epidemiologic cut-off values (ECVs) of 64 and 16 to FLZ and 1 and 2 to AMB, respectively. All of the C. gattii isolates showed high susceptibility to most drugs evaluated. Clinical isolates had lower susceptibility than environmental isolates to AMB and itraconazole whereas environmental isolates had lower susceptibility than the clinical isolates to FLZ, voriconazole, and ketoconazole. However, no difference was found in the susceptibility of the two species. The MICs and ECVs to antifungals can help to select the best therapeutic option for tracking epidemiological resistance among clinical and environmental isolates of Cryptococcus spp. around the world.


Asunto(s)
Antifúngicos/farmacología , Criptococosis/microbiología , Cryptococcus gattii/efectos de los fármacos , Cryptococcus neoformans/efectos de los fármacos , Microbiología Ambiental , Brasil , Cryptococcus gattii/aislamiento & purificación , Cryptococcus neoformans/aislamiento & purificación , Farmacorresistencia Fúngica , Humanos , Pruebas de Sensibilidad Microbiana
9.
J Fungi (Basel) ; 9(2)2023 Feb 02.
Artículo en Inglés | MEDLINE | ID: mdl-36836308

RESUMEN

Histoplasma capsulatum is a thermodymorphic fungus that causes histoplasmosis, a systemic mycosis that presents different clinical manifestations, ranging from self-limiting to acute lung infection, chronic lung infection and disseminated infection. Usually, it affects severely immunocompromised patients although immunocompetent patients can also be infected. Currently, there are no vaccines to prevent histoplasmosis and the available antifungal treatment presents moderate to high toxicity. Additionally, there are few options of antifungal drugs. Thus, the aim of this study was to predict possible protein targets for the construction of potential vaccine candidates and predict potential drug targets against H. capsulatum. Whole genome sequences from four previously published H. capsulatum strains were analyzed and submitted to different bioinformatic approaches such as reverse vaccinology and subtractive genomics. A total of four proteins were characterized as good protein candidates (vaccine antigens) for vaccine development, three of which are membrane-bound and one is secreted. In addition, it was possible to predict four cytoplasmic proteins which were classified as good protein candidates and, through molecular docking performed for each identified target, we found four natural compounds that showed favorable interactions with our target proteins. Our study can help in the development of potential vaccines and new drugs that can change the current scenario of the treatment and prevention of histoplasmosis.

10.
J Fungi (Basel) ; 9(9)2023 Aug 31.
Artículo en Inglés | MEDLINE | ID: mdl-37754997

RESUMEN

Data about the relationship between their molecular types, virulence factors, clinical presentation, antifungal susceptibility profile, and outcome are still limited for Cryptococcus deuterogattii. This study aimed to evaluate the molecular and phenotypic characteristics of 24 C. deuterogattii isolates from the southeast region of Brazil. The molecular characterization was performed by multilocus sequence typing (MLST). The antifungal susceptibility profile was obtained according to CLSI-M27-A3 and EUCAST-EDef 7.1 methods. The virulence factors were evaluated using classic techniques. The isolates were divided into four populations. The molecular analysis suggests recombinant events in most of the groups evaluated. Resistance and susceptibility dose-dependent to fluconazole were evidenced in four isolates (16%) by EUCAST and in four isolates (16%) by CLSI methods. The agreement at ±two dilutions for both methods was 100% for itraconazole, ketoconazole, and voriconazole, 96% for amphotericin B, and 92% for fluconazole. Significant differences in virulence factor expression and antifungal susceptibility to itraconazole and amphotericin B were found. The mixed infection could be suggested by the presence of variable sequence types, differences in virulence factor production, and decreased antifungal susceptibility in two isolates from the same patient. The data presented herein corroborate previous reports about the molecular diversity of C. deuterogattii around the world.

11.
Viruses ; 15(4)2023 04 10.
Artículo en Inglés | MEDLINE | ID: mdl-37112918

RESUMEN

SARS-CoV-2 (COVID-19) infection is responsible for causing a disease with a wide spectrum of clinical presentations. Predisposition to thromboembolic disease due to excessive inflammation is also attributed to the disease. The objective of this study was to characterize the clinical and laboratory aspects of hospitalized patients, in addition to studying the pattern of serum cytokines, and associate them with the occurrence of thromboembolic events. METHODOLOGY: A retrospective cohort study with 97 COVID-19 patients hospitalized from April to August 2020 in the Triângulo Mineiro macro-region was carried out. A review of medical records was conducted to evaluate the clinical and laboratory aspects and the frequency of thrombosis, as well as the measurement of cytokines, in the groups that presented or did not present a thrombotic event. RESULTS: There were seven confirmed cases of thrombotic occurrence in the cohort. A reduction in the time of prothrombin activity was observed in the group with thrombosis. Further, 27.8% of all patients had thrombocytopenia. In the group that had thrombotic events, the levels of IL1b, IL-10, and IL2 were higher (p < 0.05). CONCLUSIONS: In the studied sample, there was an increase in the inflammatory response in patients with thrombotic events, confirmed by the increase in cytokines. Furthermore, in this cohort, a link was observed between the IL-10 percentage and an increased chance of a thrombotic event.


Asunto(s)
COVID-19 , Trombosis , Humanos , COVID-19/complicaciones , SARS-CoV-2 , Interleucina-10 , Estudios Retrospectivos , Trombosis/etiología , Citocinas
12.
Mycopathologia ; 173(5-6): 321-7, 2012 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-22130645

RESUMEN

Nearly one million of cryptococcosis cases occur yearly around the world, involving mainly HIV-infected patients who are not receiving antiretroviral therapy (ART) or present poor adherence. This study aims to evaluate epidemiological, clinical and outcome aspects of patients with cryptococcosis from 1998-2010. Patients were prospectively recruited, and their medical and laboratory records were reviewed. A total of 131 cases were included, and of these, 119 (90.83%) had AIDS, 4 received a renal transplant, 2 presented systemic lupus erythematosus and 6 (4.6%) were apparently immunocompetent. Ninety-one (69.46%) were men, and the median age was 38.7 years. Cryptococcal meningitis (CM) was diagnosed in 103 (78.62%), whereas 28 (21.38%) had cryptococcal infection in other sites. Of patients with CM, 94 (91.26%) had AIDS being cryptococcosis the first defining illness in 61 (64.9%), while 37 (60.65%) of them presented simultaneously both diagnosis. Headache, altered mental status, papilledema and seizures at admission were significatively associated with a poor outcome. Of 163 different isolates, 155 (95.09%) were Cryptococcus neoformans and eight (4.88%) Cryptococcus gattii. Antifungal therapy was warranted in 8 (87.4%) patients with CM, but 46 (51.1%) died during the first days or weeks. Of 28 patients without CM, 21 (75%) received treatment, but 6 (28.6%) died. The poor outcome among this case series was similar to that reported from other developing countries, but it is paradoxal in Brazil where the ART is at free disposal in the public health services. Despite, at least 60-70% of patients present advanced immunosuppression when they receive the AIDS diagnosis.


Asunto(s)
Criptococosis/epidemiología , Criptococosis/patología , Cryptococcus gattii/aislamiento & purificación , Cryptococcus neoformans/aislamiento & purificación , Adulto , Distribución por Edad , Anciano , Antifúngicos/administración & dosificación , Brasil/epidemiología , Criptococosis/tratamiento farmacológico , Criptococosis/microbiología , Femenino , Humanos , Huésped Inmunocomprometido , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Factores de Riesgo , Distribución por Sexo , Análisis de Supervivencia , Resultado del Tratamiento
13.
Mycopathologia ; 174(1): 41-52, 2012 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-22116628

RESUMEN

Cryptococcus laurentii has been classically considered a saprophytic species, although several cases of human infection have been already reported. This study aimed to evaluate the phospholipase, proteinase and hemolysins activity, the antifungal susceptibility profile, the genetic variability by M13 and (GACA)(4) fingerprinting and the internal transcribe spacer (ITS) sequencing of 38 C. laurentii isolates recovered from captive bird droppings and surrounding hospital areas. All of them exhibited phospholipase activity, while the hemolytic activity was evidenced in 34 (89.4%) isolates. None of them exhibited proteinase activity. Twenty-seven isolates (71.1%) presented susceptibility dose dependent to fluconazole. Most isolates (94.7%) were susceptible to voriconazole, while one (2.65%) was resistant to this drug. Twenty-one (55.3%) isolates showed reduced susceptibility to itraconazole while nine (23.7%) were resistant. Three (7.9%) and five (13.1%) isolates exhibited resistance to ketoconazole and amphotericin B, respectively. Most C. laurentii fingerprinting obtained with M13 and (GACA)(4) showed high heterogeneity. By using the two primers, seven (18.4%) isolates grouped as A (CL2, CL7, and CL8), B (CL35, CL38) and C (CL29, CL30) with 100% similarity. Different from most variable surrounding hospital isolates, all but one of the pet shops strains clustered with the two primers, although they had been recovered from different neighborhoods. All isolates were identified as C. laurentii phylogenetic group I by ITS sequencing. Thus, the presence of virulence factors, a decreased antifungal susceptibility and a heterogeneous molecular pattern of the C. laurentii isolates here described suggests this species can be a potential pathogen in the context of the immunocompromised population.


Asunto(s)
Antifúngicos/farmacología , Cryptococcus/aislamiento & purificación , Dermatoglifia del ADN , Microbiología Ambiental , Enzimas/metabolismo , Tipificación Molecular , Técnicas de Tipificación Micológica , Animales , Aves , Brasil , Análisis por Conglomerados , Cryptococcus/efectos de los fármacos , Cryptococcus/enzimología , Cryptococcus/genética , ADN de Hongos/química , ADN de Hongos/genética , ADN Espaciador Ribosómico/química , ADN Espaciador Ribosómico/genética , Heces/microbiología , Variación Genética , Pruebas de Sensibilidad Microbiana , Datos de Secuencia Molecular , Filogenia , Análisis de Secuencia de ADN
14.
Mycopathologia ; 174(1): 53-9, 2012 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-22249603

RESUMEN

Different methods have been used to perform the molecular characterization of Cryptococcus neoformans. Among them, RAPD analysis is able to separate isolates of the same species and genotypes. This study aimed to evaluate clinical and environmental C. neoformans isolates from Minas Gerais, Brazil by RAPD and correlate the genetic profiles with the ones obtained by URA5-RFLP, virulence factors and antifungal susceptibility patterns. Forty-five environmental (31 from areas surrounding hospital and 14 from captive bird droppings from pet-shops) and 29 clinical C. neoformans isolates were evaluated. Antifungal susceptibility tests (Clinical and Laboratory Standards Institute), URA5-RFLP analysis and the assessment of virulence factors were performed according to their original descriptions. RAPD profiles were obtained using the L15996 primer (5'-CTCCACCATTAGCACCCAAAGC-3'). RAPD analysis generated two to 20 bands for all studied isolates. The isolates presented similarities ranging from 10.8 to 100.0%. Considering a minimum identity score of 50%, four clusters were formed. Cluster I contained 10 pet-shops bird dropping isolates, cluster II contained 22 clinical isolates most of them recovered from cerebrospinal fluid, cluster III contained 14 isolates from hospital surroundings and cluster IV contained 12 environmental isolates most from hospital surroundings. Fourteen isolates were not grouped. The RAPD profiles were clustered according to their source and URA5-RFLP pattern. No correlation between virulence factors or antifungal susceptibility profile with the obtained RAPD profiles was observed.


Asunto(s)
Criptococosis/microbiología , Cryptococcus neoformans/clasificación , Cryptococcus neoformans/aislamiento & purificación , Microbiología Ambiental , Variación Genética , Tipificación Molecular , Técnicas de Tipificación Micológica , Animales , Antifúngicos/farmacología , Brasil , Análisis por Conglomerados , Cryptococcus neoformans/genética , Proteínas Fúngicas/genética , Genotipo , Humanos , Pruebas de Sensibilidad Microbiana , Polimorfismo de Longitud del Fragmento de Restricción , Técnica del ADN Polimorfo Amplificado Aleatorio , Factores de Virulencia/genética
15.
Front Cell Infect Microbiol ; 12: 899702, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35669120

RESUMEN

COVID-19, also known as coronavirus disease 2019, is an infectious viral disease caused by SARS-CoV-2, a novel coronavirus. Since its emergence, its epidemiology has been explored; however, for some regions of the world, COVID-19's behavior, incidence, and impact remain unclear. In continental nations like Brazil, this lack of knowledge results in nonuniform control, prevention, and treatment measures, which can be controversial in some locations. This study aimed to describe the epidemiological profile of patients with COVID-19 in the macroregion of Triângulo Sul in the state of Minas Gerais (MG), Brazil. Between March 25 and October 21, 2020, data were collected and statistically analyzed from 395 hospitalized patients in the city of Uberaba, MG, suspected to have moderate or severe forms of the disease. Of the 395 suspected cases, 82% were confirmed to be positive for COVID-19. The mean age of positive patients was 58.4 years, and 60.76% were male. Following these patients throughout their hospitalization, a mortality rate of 31.3% was observed. In the population positive for COVID-19, the risk of death increased by 4% for each year of the patient's age. Likewise, the older the patient, the longer their hospitalization and the higher the risk of developing acute respiratory failure. Among the treatments tested in patients, heparin was associated with protection against mortality, and the absence of anticoagulant use was linked to a more than six times greater risk of death. Finally, comorbidities in patients with COVID-19 were positively correlated with increased hospitalization time. In summary, this study revealed that age, presence of comorbidities, length of hospitalization, and drug treatment considerably altered COVID-19's lethality. To understand infection rates and the factors involved in COVID-19's lethality, knowledge of the local epidemiology is necessary.


Asunto(s)
COVID-19 , Brasil/epidemiología , COVID-19/epidemiología , Femenino , Hospitalización , Humanos , Pacientes Internos , Masculino , Persona de Mediana Edad , SARS-CoV-2
17.
Med Mycol ; 49(4): 352-5, 2011 May.
Artículo en Inglés | MEDLINE | ID: mdl-21028946

RESUMEN

This paper presents the case of a 75-year-old Brazilian man who developed inflammatory skin lesions with nodules and ulcerations on the right forearm after an injury caused by handling barbed-wire and Eucalyptus spp. logs. Histopathological assessment of the lesions showed granulomatous processes with yeasts similar to Cryptococcus spp. Tissue fragments yielded yeasts when cultured that were identified as Cryptococcus gattii VGII through biochemical reactions and URA5-RFLP genotype. No evidence of systemic involvement or any underlying immunosuppressive diseases were identified, which supported the diagnosis of primary cutaneous cryptococcosis. After 5 months on therapy with high fluconazole doses, the skin lesions had fully healed.


Asunto(s)
Criptococosis/diagnóstico , Cryptococcus gattii/aislamiento & purificación , Dermatomicosis/diagnóstico , Traumatismos del Antebrazo/microbiología , Anciano , Antifúngicos/uso terapéutico , Criptococosis/tratamiento farmacológico , Criptococosis/patología , Cryptococcus gattii/patogenicidad , Dermatomicosis/tratamiento farmacológico , Fluconazol/uso terapéutico , Humanos , Masculino
18.
Mycoses ; 54(5): e294-300, 2011 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-20492533

RESUMEN

To evaluate Cryptococcus spp. molecular types isolated from captive birds' droppings, an epidemiological survey was carried out in Uberaba, Minas Gerais, Brazil, from December 2006 to September 2008. A total of 253 samples of bird excreta (120 fresh and 133 dry) were collected from pet shop cages and houses in different neighbourhoods. Cryptococcus neoformans was isolated in 19 (14.28%) dry samples and one fresh sample (0.84%). Cryptococcus laurentii was recovered from seven (5.26%) dry samples, but not in the fresh samples. The canavanine-glycine-bromothymol blue test was positive in all but one of the C. laurentii isolates. Cryptococcus neoformans molecular typing was performed using URA5-RFLP and the mating type locus using mating type specific PCR. Nineteen (95.0%) presented genotype VNI and one VNII (5.0%). In addition, all isolates presented mating type α. Thus, the genotype of the environmental C. neoformans isolates observed in this study is in accordance with others already reported around the world and adds information about its distribution in Brazil. Cryptococcus laurentii strains were typed using URA5-RFLP and M13 fingerprinting, which showed similar profiles among them. Thus, despite the low number of C. laurentii isolates analysed, their molecular profile is different from another already reported.


Asunto(s)
Enfermedades de las Aves/microbiología , Aves/microbiología , Criptococosis/veterinaria , Cryptococcus neoformans/clasificación , Cryptococcus neoformans/genética , Tipificación Molecular , Técnicas de Tipificación Micológica , Animales , Brasil , Análisis por Conglomerados , Criptococosis/microbiología , Cryptococcus neoformans/aislamiento & purificación , ADN de Hongos/genética , Heces/microbiología , Genes del Tipo Sexual de los Hongos , Genotipo , Micología/métodos , Reacción en Cadena de la Polimerasa , Polimorfismo de Longitud del Fragmento de Restricción
19.
J Fungi (Basel) ; 6(3)2020 Aug 07.
Artículo en Inglés | MEDLINE | ID: mdl-32784766

RESUMEN

Galleria mellonella larvae have been widely used as alternative non-mammalian models for the study of fungal virulence and pathogenesis. The larvae can be acquired in small volumes from worm farms, pet stores, or other independent suppliers commonly found in the United States and parts of Europe. However, in countries with no or limited commercial availability, the process of shipping these larvae can cause them stress, resulting in decreased or altered immunity. Furthermore, the conditions used to rear these larvae including diet, humidity, temperature, and maintenance procedures vary among the suppliers. Variation in these factors can affect the response of G. mellonella larvae to infection, thereby decreasing the reproducibility of fungal virulence experiments. There is a critical need for standardized procedures and incubation conditions for rearing G. mellonella to produce quality, unstressed larvae with the least genetic variability. In order to standardize these procedures, cost-effective protocols for the propagation and maintenance of G. mellonella larvae using an artificial diet, which has been successfully used in our own laboratory, requiring minimal equipment and expertise, are herein described. Examples for the application of this model in fungal pathogenicity and gene knockout studies as feasible alternatives for traditionally used animal models are also provided.

20.
J Fungi (Basel) ; 6(3)2020 Aug 25.
Artículo en Inglés | MEDLINE | ID: mdl-32854208

RESUMEN

In recent decades, emerging fungal infections have changed the clinical mycology scenario as a consequence of the advances in medical diagnostics and therapeutic procedures, long hospitalization times, and the growing number of individuals with debilitating chronic diseases and impaired immune systems. This report presents a 19 months old Brazilian female patient who developed a severe fungal sepsis by an uncommon yeast. She was admitted at the intensive care unit with severe pneumonia, bronchopulmonary dysplasia, and weight-for-age z score of less than -2. She remained more than 30 days in the intensive care unit where she had a femoral venous catheter placement, enteral nutrition, broad-spectrum antibiotic therapy, and prophylaxis with fluconazole. Moreover, pericardiocentesis was performed due to cardiac tamponade. She had a previous history of prematurity, cardiac surgery due to patent ductus arteriosus, and a long period of hospital stay. Despite the antifungal prophylaxis, two yeast isolates were recovered from blood and then identified by classical mycological methods and internal transcribed spacer (ITS) sequencing as Wickerhamomyces anomalus. Both isolates exhibited susceptibility to amphotericin B, ketoconazole, itraconazole, voriconazole, and fluconazole. Her clinical state worsened, presenting anasarca, epistaxis, and hemorrhagic suffusions in the mouth, sclera, oliguria, and bradycardia. Two days after the first positive culture, she presented a gradual reduction of the white blood cells count, with severe leukopenia and neutropenia. She died five days after.

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