Histoplasmosis: A Hidden Lung Threat from Soil and Droppings

Histoplasmosis is a lung infection caused by breathing in fungal spores from the soil or animal droppings. The fungus, Histoplasma capsulatum, thrives in specific regions of the US, particularly the central, southeastern, and mid-Atlantic states. Symptoms of the infection usually appear around 10 days after exposure. Most cases of acute histoplasmosis are mild and do not lead to serious complications. However, the disease can become chronic and spread throughout the body, posing a life-threatening risk if left untreated.

In severe cases, histoplasmosis can cause acute respiratory distress syndrome, heart problems, meningitis, and adrenal gland dysfunction. Skin lesions occur in 10 to 15 percent of cases where the infection has disseminated. Testing for the condition involves blood, urine, or tissue samples, and imaging such as X-rays or CT scans may also be used.

Certain groups face higher risks, including those with weakened immune systems and individuals working in high-risk occupations. The spores are commonly found in soil contaminated with bat or bird droppings. Early diagnosis is critical, as untreated chronic histoplasmosis can be fatal. The infection’s severity varies widely, from mild respiratory symptoms to widespread organ damage. Doctors rely on laboratory tests and imaging to confirm cases and determine the appropriate treatment.