Valley Fever

Brief summary: Valley fever, also called coccidioidomycosis, is a fungal infection acquired by inhaling spores from soil. It is not spread from person to person and most commonly affects the lungs. ^[1][2]

Valley fever is caused by inhalation of Coccidioides spores found in soil, particularly in arid and endemic regions. The infection most often involves the lungs and may resemble a prolonged respiratory illness. Some people have very mild disease or none at all, whereas others may develop marked fatigue, fever, cough, chest pain, and shortness of breath. Because the symptoms can overlap with viral infections or pneumonia, diagnosis may be delayed, especially if travel or environmental exposure history is not considered. ^[1][2][3]

The disease is not contagious from person to person. Infection occurs through environmental exposure, especially when soil is disturbed by wind, construction, agriculture, or outdoor activity in endemic areas. This distinction is important because patients often worry about transmitting the infection to family members. The main preventive focus is therefore exposure reduction rather than isolation. ^[1][4]

Symptoms commonly include cough, fever, fatigue, night sweats, chest pain, muscle aches, joint pain, and sometimes rash. In some people, exhaustion lasts much longer than the acute respiratory symptoms. In more severe cases, the infection may spread beyond the lungs to the skin, bones, joints, or central nervous system. Disseminated disease is much less common but clinically serious. ^[1][2][3]

Not every patient needs the same treatment. Many mild cases improve spontaneously with monitoring and supportive care. However, antifungal treatment may be recommended in patients with prolonged symptoms, severe lung disease, disseminated infection, immunosuppression, pregnancy, or other risk factors. The decision depends on disease severity, host risk, and the site of infection. ^[1][2]

Diagnosis may involve exposure history, serologic blood tests, imaging, and, in some cases, direct microbiologic testing. Travel or residence in endemic areas is especially important information. Without this clue, the illness may be mistaken for bacterial pneumonia or a nonresolving viral infection. For that reason, a good environmental and travel history is a central part of evaluation. ^[1][2]

People at higher risk for severe disease include those with weakened immune systems, pregnant individuals, and some people with chronic underlying diseases. In these groups, clinical deterioration or dissemination is more concerning and follow-up should be closer. ^[1][2]

Prevention focuses on reducing exposure in endemic regions. Avoiding heavy dust exposure when possible, using protective equipment in high-risk occupational settings, and being cautious during dust storms or excavation can help lower risk. Still, complete prevention is not always possible in endemic environments. ^[1][4]

Urgent evaluation is warranted if there is worsening shortness of breath, confusion, severe weakness, persistent high fever, severe headache, or signs suggesting spread beyond the lungs. Valley fever is often manageable, but because the clinical course can vary widely, individualized medical assessment is important. ^[1][2][3]