Histoplasmosis is caused by the yeast like fungus Histoplasma capsulatum, which grows in pigeon, bat, and chicken droppings.Contracted by the inhalation of dust from animal droppings, by ingestion, or through the skin. The fungus causing histoplasmosis lives as a parasite in certain tissue and blood cells of the infected person.
An infection in the respiratory system is similar to tuberculosis—small spots form in the lungs—although these lesions heal on their own. A progressive form typically invades the bone marrow and is rapidly fatal.
Aspergillosis is an infection of the skin, nasal sinuses, and lungs or other internal organs caused by molds of the genus Aspergillus. The disease, contracted by the inhalation of spores, occurs most often among agricultural workers.
Itching and pain are frequent symptoms, and if scratching is prolonged, the skin may thicken and become gray or black. A virulent type of pneumonia is caused by the yeast like fungus Pneumocystis carinii, particularly prevalent in people with compromised immune systems, such as AIDS patients.
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