In many people, valley fever causes mild, flu-like symptoms or none at all. Valley fever, therefore, often goes undiagnosed and goes away without treatment.
- Blood in the sputum
- Chest pain
- Sore throat
- Sputum production
In some people, however the infection may become severe and lead to a pneumonia-like illness. The disease may also affect other parts of the body, such as the skin, joints and brain. Valley fever can be fatal in people with weakened immune systems. The severe form of valley fever may develop a few weeks, months or sometimes years after the primary infection, and it may develop even after leaving the area where the fungi live.
Symptoms of this form include:
- Low-grade fever
- Weight loss
The heavy involvement of the lungs may cause difficulty breathing or the skin to turn bluish from lack of oxygen. If it spreads beyond the lungs, it usually involves one or more tissue sites in the bones, joints, skin, organs or brain. Sites away from the lungs often become chronic and recur, sometimes long after antifungal therapy has been completed, seemingly successfully.
Causes and Risk Factors
Valley fever is caused by the fungus coccidioides immitis, which grows in arid soil through the southwestern United States, Mexico, Central America and South America. It was first identified in California's San Joaquin Valley. Infection occurs when the spores of the fungus are inhaled.
Progressive valley fever is more common in men than women. People who are at a greater risk of contracting valley fever are those who:
- Have HIV infection
- Are on therapy that suppresses their immune systems
- Are in the second half of pregnancy
- Have just given birth
- Are elderly