Valley fever is common here and looks like a lot of other respiratory illnesses. Here is the plain version.
What it is
Valley fever is an infection caused by a fungus that lives in the soil here. People get it by breathing in dust that carries the fungus. It is not spread from person to person, and you cannot catch it from a family member or a pet.
Valley fever is common in the San Joaquin Valley. In 2024, the most recent year with final numbers, the California Department of Public Health counted about 3,900 Valley fever cases in Kern County — roughly a third of all cases reported in California that year. Counts move year to year: the county reported about 2,600 cases in 2020 and about 2,400 in 2022 before rising to about 3,900 in 2024. Preliminary state counts for 2025 and for the first half of 2026 are running below 2024. Final 2025 numbers have not been published yet.
Source: California Department of Public Health, Valley Fever Data Dashboards. Final case counts through 2024; preliminary counts through June 2026.
Valley fever occurs year-round, but exposure tends to go up in the dry months of summer and early fall, and most cases are diagnosed in the fall and early winter. There is no season in which it stops being worth considering.
Most people who breathe it in are fine
According to the California Department of Public Health, most people who breathe in the fungus — about 6 in 10 — never develop symptoms and may never know they were exposed. Serious illness that spreads beyond the lungs is uncommon, affecting about 1 in 100 people who get Valley fever, and most people recover fully.
That is the honest framing. Valley fever is worth knowing about because it is frequently mistaken for something else, not because it is likely to be severe.
What it looks like
Valley fever usually starts one to three weeks after exposure and can look like pneumonia or the flu — cough, fever, tiredness, chest pain, night sweats, muscle or joint pain, sometimes a rash or bumps on the skin, often on the front of the legs. Symptoms often last a few weeks to a few months, and tiredness can linger after everything else has cleared.
Because it looks like other respiratory illnesses, including COVID-19 and the flu, testing is the only way to tell them apart.
When to ask about testing
If a cough, fever, or unusual tiredness has lasted more than a week or so, it is reasonable to come in and be checked. A cough that will not clear in Bakersfield is worth testing, not waiting out. Valley fever is one of the things we consider here, and it is one of the reasons a “walking pneumonia” that is not improving on antibiotics should be looked at again rather than re-treated.
Ask sooner if you have spent time around disturbed soil or outdoor dust — construction, agriculture, landscaping, firefighting, field work, digging, or yard work on a windy day. Anyone who breathes Bakersfield air can get Valley fever; exposure is simply higher for people who work in it.
What testing and treatment involve
Testing for Valley fever usually means a blood test, and sometimes a chest X-ray. We can order both. Not everyone who has it needs medication — antifungal treatment is used for some patients, and that is a decision made case by case with you. When a case needs infectious disease or pulmonology involvement, we make the referral and stay in the loop rather than handing you off and disappearing.
Who is more likely to get seriously ill
The California Department of Public Health lists adults 60 and older, people who are pregnant, people with diabetes, people whose immune systems are weakened by illness or medication — including cancer treatment, steroids, autoimmune illness, HIV, or an organ transplant — and people who are Black or Filipino. If that describes you, tell us. It changes how quickly we test rather than how worried you should be.