Resumo

CAICEDO BEJARANO, Luz Dary  e  ALVAREZ, María Inés. Growth of Cryptococcus neoformans/Cryptococcus gattii species complex in pigeon excreta. Entramado [online]. 2020, vol.16, n.1, pp.218-229. ISSN 1900-3803.  https://doi.org/10.18041/1900-3803/entramado.1.6087.

Cryptococcus neoformans/Cryptococcus gattii are etiologic agents of cryptococcosis, the former has a worldwide distribution, and its habitat is associated with pigeon excreta (Columba livia), whereas the latter it has been mainly associated with trees and rarely from the feces of birds. In this study was to compare, under laboratory conditions, the growth of C. neoformans and C. gattii in extracts of pigeon excreta. Two extracts of captive bird feces were used: one prepared from a sample in which C. neoformans was isolated (positive extract) and one from which sample was negative for this fungus (negative extract). Under laboratory conditions, the extracts allowed the development of both species. Both showed a uniform pattern of growth in the negative extract, whereas in the positive, C. neoformans growth was significantly higher than that of C. gattii (P = 0.0001). The growth of the C. gattii was lower in positive extracts and it seems to decrease at pH greater than 7.5, whereas the growth of C. neoformans showed no significant differences regardless of pH variations. Further studies are need to elucidate the interaction between these two species in the excreta of pigeon.

Palavras-chave : Cryptococcus gattii; Cryptococcus neoformans; growth; pigeon excreta; Columba livia.

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