Most people with valley fever recover fully without any lasting effects. Roughly 90 to 95% of infections resolve on their own or with a course of antifungal medication, and the fungus no longer causes problems. But “curable” comes with a caveat: a small percentage of cases become chronic or spread beyond the lungs, and those forms require long-term, sometimes lifelong, treatment.
How Most Cases Resolve
Valley fever starts as a lung infection caused by breathing in fungal spores found in desert soil. The primary lung infection is often self-limiting, meaning your immune system clears it without antifungal drugs. Many people never develop symptoms at all. Those who do typically experience a flu-like illness with cough, fatigue, fever, and joint aches that can drag on for weeks to several months before fully resolving.
The fatigue tends to be the most stubborn symptom. People frequently report lingering tiredness and joint pain lasting months, even after the active infection has cleared. This prolonged recovery doesn’t mean the infection is still active. It reflects how hard your body worked to fight it off.
When Antifungal Treatment Is Needed
Not everyone can fight off the infection on their own. Doctors typically prescribe antifungal medication when symptoms are severe, when the infection lingers beyond a few months, or when blood tests show high antibody levels suggesting a more aggressive infection. Treatment usually lasts three to six months for straightforward lung infections, though some people need longer courses.
People with weakened immune systems, pregnant women, and those of African or Filipino descent face higher risk of the infection becoming severe. For these groups, treatment often starts earlier and lasts longer as a precaution.
What Happens in the 5 to 10% Who Don’t Recover
About 5 to 10% of patients fail to recover from the initial lung infection and develop chronic pulmonary disease or disseminated infection, where the fungus spreads to the skin, bones, joints, or brain. Symptoms in these cases can persist for months or longer, and the treatment approach changes significantly.
Bone and joint infections require extended antifungal therapy, sometimes for years. Severe cases involving the spine may need surgical intervention alongside medication, particularly when there’s risk of nerve compression or spinal instability. Skin infections can also recur. In one study of patients with disseminated skin disease, about 24% experienced at least one recurrence, with most happening at previously affected sites. The median time between stopping medication and recurrence was 14 months, but some recurrences appeared years later.
The most serious complication is meningitis, an infection of the membranes surrounding the brain and spinal cord. Valley fever meningitis is fatal without treatment, and it requires lifelong antifungal medication. There is no point at which treatment can safely stop. Some patients also develop a buildup of fluid pressure in the brain that may require a permanent surgical shunt.
Can the Fungus Come Back?
This is one of the trickier aspects of valley fever. The fungus can persist in tissue even after symptoms disappear, potentially re-emerging when immune conditions change. This doesn’t happen to most people, but it means a past infection doesn’t guarantee lifelong immunity the way some viral infections do.
Recurrences are most common in people who had disseminated disease, and they tend to happen after antifungal therapy has been stopped. About 90% of recurrences in one study occurred while patients were off medication. This is why doctors monitor antibody levels over time. Rising titers on blood tests can signal the infection is reactivating before symptoms return.
How Valley Fever Is Diagnosed
Diagnosis relies primarily on blood tests that detect antibodies your immune system produces against the fungus. Two types of antibodies matter: one appears early in infection, and another develops later and can be tracked over time to gauge severity. No single test is perfect. Sensitivity ranges from about 59 to 88% depending on the test used, which means a negative result doesn’t always rule it out. If a doctor strongly suspects valley fever based on your symptoms and where you live or have traveled, they may repeat testing two to six weeks later.
Antibody levels also serve as a monitoring tool during treatment. Declining levels generally indicate the infection is coming under control, while rising levels can signal a problem.
Recovery Timeline
For the majority of people, valley fever follows a predictable if frustrating course. Symptoms sometimes appear abruptly but more often build gradually, then persist for weeks to several months. The acute phase, with fever, cough, and chest pain, typically improves within a few weeks. Fatigue and joint soreness often linger well beyond that.
Full recovery from an uncomplicated case generally takes one to six months, though some people report feeling not quite right for longer. If you’re on antifungal medication, your doctor will likely check your blood work periodically before deciding it’s safe to stop treatment. For chronic or disseminated cases, the timeline stretches to years or becomes indefinite.
Reducing Your Risk of Exposure
Valley fever spores live in the soil of arid regions, particularly the southwestern United States, parts of Mexico, and Central and South America. You can’t eliminate risk entirely if you live in these areas, but certain precautions lower your exposure. Avoid areas with heavy dust, especially construction and excavation sites where soil is being actively disturbed. During dust storms, stay indoors with windows closed. Gardening, digging, and other activities that break up soil increase the chance of inhaling spores.
If your work involves soil disturbance in an endemic area, wearing an N95 respirator provides some protection, though it isn’t foolproof. Wetting soil before digging can reduce the amount of dust that becomes airborne.