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[Cryptococcus neoformans isolation from the soil in Panama]
F Rivas1, M C De Martin, V Rojas
1Departamento de Microbiología, Area de Micología, Facultad de Medicina, Universidad de Panamá.
Abstract:
Reports of Cryptococcus neoformans isolations from patients in Panama have appeared since 1978, but to our knowledge, thIs is the first report of isolation of this organism from soil samples in the Republic. Of 25 soil samples analyzed, two (25%) yielded the organism on birdseed agar medium. Canavanine-glycine-bromthymol blue medium served to identify the isolates as belonging to C. neorformans var neoformans, and not C. Neoformans var. gattii. Initially, isolates did not have capsules, but upon passage through newborn mice, wide capsules developed. This finding has important public health implications, since non-encapsulated environmental organisms, once in the host, can develop capsules, which significantly contribute to virulence.
Insights
This study reports the first isolation of Cryptococcus neoformans from Panamanian soil. Environmental isolates, initially non-encapsulated, developed capsules after mouse passage, highlighting public health risks.
Area of Science:
- Medical Mycology
- Environmental Microbiology
- Public Health
Background:
- Cryptococcus neoformans is an opportunistic fungal pathogen.
- Previous isolations in Panama were from patients, not environmental sources.
- The environmental reservoir of C. neoformans in Panama remained largely unexplored.
Purpose of the Study:
- To investigate the presence of Cryptococcus neoformans in Panamanian soil.
- To characterize environmental isolates of C. neoformans.
- To assess the public health implications of environmental fungal isolates.
Main Methods:
- Analysis of 25 soil samples collected in the Republic of Panama.
- Isolation and cultivation of fungi using birdseed agar medium.
- Identification of Cryptococcus neoformans var. neoformans using Canavanine-glycine-bromthymol blue medium.
- In vivo virulence study involving passage through newborn mice.
Main Results:
- Two out of 25 soil samples (8%) yielded Cryptococcus neoformans.
- Isolates were identified as C. neoformans var. neoformans, not C. neoformans var. gattii.
- Initially non-encapsulated isolates developed prominent capsules after passage through newborn mice.
Conclusions:
- This is the first report of Cryptococcus neoformans isolation from soil in Panama.
- Environmental C. neoformans isolates can acquire capsules in vivo, potentially increasing virulence.
- Findings underscore the importance of environmental surveillance for pathogenic fungi and their public health implications.
