Ecology of pathogenic yeasts in Amazonian soil.

Applied and Environmental Microbiology
W Y MokE G Muniz

Abstract

In an investigation of Amazonian soil as a natural reservoir for pathogenic fungi, 1,949 soil samples collected from diverse geographical and ecological settings of the Brazilian Amazon Basin were analyzed for the presence of non-keratinophilic fungi by the indirect mouse inoculation procedure and for the presence of keratinophilic fungi by the hair bait technique. All soil samples were acidic with low pH values. From 12% of the soil samples, 241 yeast and yeastlike isolates pertaining to six genera and 82 species were recovered, of which 63% were Torulopsis and 26% were Candida species. Nine fungi with known pathogenic potentials were encountered among 43% (104) of the isolates: T. glabrata, C. guilliermondii, C. albicans, C. pseudotropicalis, C. stellatoidea, C. tropicalis, Rhodotorula rubra, and Wangiella dermatitidis. The yeast flora was marked by species diversity, low frequency of each species, random geographical distribution, and an apparent lack of species clustering. The composition and distribution of the yeast flora in soil differed from those of the yeast flora harbored by bats, suggesting that the Amazonian external environment and internal bat organs act as independent natural habitats for yeasts.

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Citations

Mar 1, 1985·Mycopathologia·R D NaiffM F Naiff
Apr 17, 2009·Journal of Medical Microbiology·Ki Ho HongEui-Chong Kim
Oct 1, 1985·Mycopathologia·W Y Mok, C Morato de Carvalho
Aug 25, 2000·Journal of Basic Microbiology·E Sláviková, R Vadkertiová
Dec 20, 2015·FEMS Yeast Research·Judith LegrandDelphine Sicard
Jul 21, 2020·Transboundary and Emerging Diseases·Josileide Araújo da SilvaValiria Duarte Cerqueira
Jun 29, 2018·Journal of Applied Microbiology·S K RajasekharanJ Lee
Jan 25, 2018·Yeast·Andrey M Yurkov
Feb 13, 2018·Indian Journal of Microbiology·Satish Kumar RajasekharanJintae Lee

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