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Distribution of Cryptococcus neoformans in a natural site
Infection and Immunity
|February 1, 1981
Summary
Dry pigeon droppings in a vacant tower contained significantly more viable Cryptococcus neoformans cells than compact piles. These droppings can generate infectious aerosols capable of human lung deposition.
Area of Science:
- Mycology
- Environmental Microbiology
- Public Health
Background:
- Cryptococcus neoformans is a fungus found in pigeon droppings.
- Inhalation of C. neoformans can cause cryptococcosis, a serious infection.
- Understanding C. neoformans distribution in environmental reservoirs is crucial for public health.
Purpose of the Study:
- To quantify viable Cryptococcus neoformans cells in pigeon droppings.
- To assess the potential for aerosolization and human exposure.
- To discuss environmental factors influencing C. neoformans.
Main Methods:
- Viable cell counts of C. neoformans from pigeon droppings (dry debris vs. compact pile).
- Generation and analysis of aerosols from pigeon dropping debris.
- Determination of cell size distribution in aerosols.
Main Results:
- Dry, scattered pigeon dropping debris had 2.6 x 10^6 viable cells/g, 300 times more than compact droppings (7.4 x 10^3 cells/g).
- Aerosols from debris contained 360 viable cells/31L, with 7.5% (1.1-3.3 micrometers) capable of lung deposition.
- Cellular viability and aerosolization potential varied significantly with droppings' physical state.
Conclusions:
- Dry, dispersed pigeon droppings are a potent source of viable C. neoformans.
- Aerosolized C. neoformans from droppings pose an inhalation risk.
- Environmental conditions affecting droppings influence C. neoformans transmission dynamics.