How is Coccidioidomycosis pneumonia caused?

How is Coccidioidomycosis pneumonia caused?

• A. Waterborne fungus in humid climates.
• B. Inhalation of airborne spores of Coccidioides; arid soil of the southwestern United States, Mexico, and parts of Central/South America; soil disturbance makes spores airborne.
• C. Transmission via animal bites.
• D. Skin contact with contaminated soil.

Answer: (B)

Coccidioidomycosis pneumonia arises when people inhale airborne spores from Coccidioides fungi that live in dry, hot soils in the southwestern United States, Mexico, and parts of Central and South America. Disturbing this soil—through activities like construction, farming, or dust storms—releases spores into the air, which are then inhaled into the lungs. Once in the lungs, the spores can trigger an inflammatory response that resembles pneumonia, with fever, cough, chest pain, and infiltrates on imaging. This route of infection—airborne inhalation from arid soil—is why exposure in dusty desert regions is the classic risk factor. It’s not transmitted by water, animal bites, or skin contact with soil, which is why those options don’t explain the pulmonary disease.

Coccidioidomycosis pneumonia arises when people inhale airborne spores from Coccidioides fungi that live in dry, hot soils in the southwestern United States, Mexico, and parts of Central and South America. Disturbing this soil—through activities like construction, farming, or dust storms—releases spores into the air, which are then inhaled into the lungs. Once in the lungs, the spores can trigger an inflammatory response that resembles pneumonia, with fever, cough, chest pain, and infiltrates on imaging. This route of infection—airborne inhalation from arid soil—is why exposure in dusty desert regions is the classic risk factor. It’s not transmitted by water, animal bites, or skin contact with soil, which is why those options don’t explain the pulmonary disease.