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1.
Am J Trop Med Hyg ; 2022 Mar 14.
Artigo em Inglês | MEDLINE | ID: mdl-35292592

RESUMO

Histoplasmosis, one of the most frequent endemic mycoses in the Americas, is caused by the inhalation of airborne conidia of Histoplasma capsulatum. Better understanding of the distribution of this fungus in the environment is important for the development of appropriate public health measures to prevent human infections. Previously, we used Hc100 nested polymerase chain reaction (PCR) to identify H. capsulatum DNA in 10% of environmental samples in Colombia. Here, we validate a 100-kDa real-time PCR assay for the detection of this fungus in the environment. Using this method, we identified H. capsulatum DNA in 80% of samples of raw organic materials, such as chicken manure, soil from caves, and bird and bat guano, as well as in 62% of samples of organic fertilizer that underwent the composting process. We demonstrated that 100-KDa real-time PCR is a useful tool for environmental surveillance that can be used to identify the potential reservoirs of H. capsulatum and to prevent outbreaks, especially in people with the higher risk of exposure, such as spelunkers, farmers, poultry manure collectors, and anyone who handle organic fertilizers or bat and bird excreta.

2.
Heliyon ; 5(7): e02084, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31372546

RESUMO

The thermally dimorphic fungus Histoplasma capsulatum is the causative agent of histoplasmosis, one of the most prevalent endemic mycosis in the Americas. In tropical regions, agro-ecosystems require organic matter replacement, therefore, the use of organic fertilizers has increased disregarding the fact that certain number of such fertilizers might be contaminated with the fungus, and with their handling resulting in human cases and even outbreaks of histoplasmosis. Additionally, in Colombia, chicken manure is the most common raw material used in the production of organic fertilizers. In this work, we reported the isolation of this fungus from chicken manure, and genetically compared with 42 clinical isolates. The genetically compared environmental isolates grouped together with the clinical ones. Our result suggests that chicken manure may be one of H. capsulatum infection sources. Also, the phylogenetic analyses done with other H. capsulatum isolates indicate that the Colombian isolates are widely distributed in the relational tree thus reveling towards the great genetic diversity among the H. capsulatum Colombian isolates.

3.
Genome Announc ; 6(24)2018 Jun 14.
Artigo em Inglês | MEDLINE | ID: mdl-29903814

RESUMO

Sporothrix schenckii is a thermodimorphic fungal pathogen with a high genetic diversity. In this work, we present the assembly and similarity analysis of the whole-genome sequences of two clinical isolates from Colombia of S. schenckiisensu stricto.

4.
FEMS Immunol Med Microbiol ; 47(1): 56-66, 2006 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-16706788

RESUMO

Genetic factors influence susceptibility to Paracoccidioidomycosis, a Latin American endemic mycosis. The pattern of susceptibility of congenic mouse strains infected with Paracoccidioides brasiliensis resembles the pattern of the Nramp1 gene. Thus, congenic murine bone-marrow-derived macrophage lines B10R (Nramp1rGly169) and B10S (null Nramp1 protein expression, Nramp1sAsp169) were infected with P. brasiliensis conidia and compared, under opsonic and nonopsonic conditions. Opsonization increased the percentage of phagocytosis by both cell lines. B10R macrophages exhibited a higher percentage of cells with associated conidia and higher number of conidia per macrophage than B10S. Heat-inactivation and EDTA treatment of serum used for opsonization, and treatment of macrophages with anti-complement receptor 3 (CR3) decreased phagocytosis by both cell lines. alpha-methyl-d-mannoside reduced phagocytosis by B10R macrophages, suggesting that the mannose receptor participates in phagocytosis by these cells. The CR3 expression was similar on both cell lines and B10R expressed more mannose receptors, but neither cell line expressed CR1. IFNgamma decreased the conversion of conidia to the yeast form of P. brasiliensis in B10R, but not in B10S macrophages.


Assuntos
Proteínas de Transporte de Cátions/imunologia , Complemento C3/imunologia , Lectinas Tipo C/imunologia , Macrófagos/imunologia , Lectinas de Ligação a Manose/imunologia , Paracoccidioides/imunologia , Receptores de Superfície Celular/imunologia , Animais , Antígeno CD11b/biossíntese , Antígeno CD11b/imunologia , Proteínas de Transporte de Cátions/genética , Linhagem Celular , Complemento C3/metabolismo , Predisposição Genética para Doença , Lectinas Tipo C/metabolismo , Antígeno de Macrófago 1/biossíntese , Antígeno de Macrófago 1/imunologia , Macrófagos/efeitos dos fármacos , Receptor de Manose , Lectinas de Ligação a Manose/metabolismo , Metilmanosídeos/farmacologia , Camundongos , Camundongos Congênicos , Paracoccidioides/genética , Paracoccidioidomicose/genética , Paracoccidioidomicose/imunologia , Paracoccidioidomicose/microbiologia , Fagocitose/efeitos dos fármacos , Fagocitose/genética , Fagocitose/fisiologia , Receptores de Superfície Celular/metabolismo , Receptores de Complemento 3b/antagonistas & inibidores , Receptores de Complemento 3b/imunologia
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