Are you planning a trip or living in the American Southwest? Here is what you need to know about Valley fever and how it affects your lungs.

Have you ever traveled to the southwestern United States, or parts of Central and South America? Or maybe you are planning a trip there soon? If so, this guide is important for you. Today, we are taking a close look at Valley fever, a unique fungal infection that affects your lungs and breathing system.

Understanding where this condition comes from, how it spreads, and what signs to watch for can help you stay safe. Whether you live abroad or are just curious about international health topics, knowing the facts helps you protect your well-being.

What Is Valley Fever?

Simply put, Valley fever is a lung infection caused by a fungus. The fungus belongs to a group called Coccidioides. These fungi live naturally in the soil. You find them mostly in the southwestern United States, such as Arizona and California, parts of Washington state, and various regions across Central and South America.

Medical experts also call this initial stage of infection acute coccidioidomycosis. When you first breathe in the spores, you might develop mild flu-like signs, or you might not notice any signs at all. However, in some cases, the condition can become more serious and require medical care.

Thousands of new cases are reported every year, especially in dry regions where dust travels easily on the wind. Knowing the medical name, coccidioidomycosis, helps you understand doctor notes and lab reports if you ever need them.

Symptoms of Valley Fever.

In many cases, this infection causes no outward signs at all. If you do develop signs of Valley fever, they usually show up one to three weeks after you breathe in the fungal spores. These signs often look very similar to a bad flu or regular pneumonia.

Common signs and symptoms include:

• A red, bumpy skin rash, sometimes turning purple, brown, or dark, known medically as erythema nodosum.
• A persistent cough that may bring up small amounts of mucus.
• Severe tiredness and low energy, known as fatigue.
• A recurring fever or chills.
• Achiness in your joints, especially in your knees or ankles.
• Muscle aches and general body soreness.
• Heavy sweating during the night.
• Shortness of breath, especially when moving around.

Doctors sometimes refer to the combination of skin bumps, fever, and stiff, painful joints as desert rheumatism.

How Do People Get Valley Fever?

Two main species of fungus cause Valley fever:

1. Coccidioides immitis: This species grows primarily in the soils of California.
2. Coccidioides posadasii: This species is found across other southwestern US states, Mexico, and Central and South America.

Both species cause identical clinical signs and health effects.

The infection happens when soil is disturbed. Activities like farming, construction, digging, or strong winds break up the dry dirt. This disturbance sends tiny reproductive seed units, called spores, floating into the air. If you walk through or live in these areas, you can breathe those spores straight into your lungs.

Once inside your lungs, the spores grow into larger structures called spherules. These spherules can multiply and spread inside the lung tissue.

Note for International Travelers: These specific fungi do not live naturally in the soil of South Asia, including Sri Lanka. Local residents do not need to worry about catching it at home. The risk applies primarily to people living in or traveling through endemic regions overseas.

Is Valley Fever Contagious?

No, Valley fever is not contagious. You cannot catch it from another person, and you cannot pass it to your family members or friends. It spreads strictly through the environmental inhalation of outdoor dust spores.

In very rare instances, skin sores caused by advanced forms of the disease could theoretically harbor spores, but person-to-person transmission remains practically non-existent. Your main source of exposure is always the ambient outdoor air in affected dry zones.

Who Is at Highest Risk?

Anyone who breathes in the fungal spores can potentially develop Valley fever. However, certain groups face a much higher chance of severe illness or complications:

• People over the age of 60, due to natural changes in immune defense.
• people with African or Filipino heritage, who experience higher rates of severe dissemination.
• Pregnant people, especially during the third trimester.
• People with weakened immune systems, such as those with HIV or people taking immunosuppressant drugs after organ transplants.
• people managing chronic health conditions like diabetes mellitus.
• Outdoor workers, construction crews, and farmers working in dusty soil environments.

Potential Complications of Valley Fever.

Most people recover completely without severe problems. Only a small percentage of cases progress to serious illness. When complications do happen, they can include:

• Severe pneumonia that does not clear up easily.
• Acute respiratory distress syndrome, making breathing very difficult.
• Fluid buildup around the lungs, known as a pleural effusion.
• Spread of the infection beyond the lungs to other parts of the body, known as disseminated coccidioidomycosis.

Disseminated disease is the most dangerous form. It can affect your skin, bones, joints, and even the membranes surrounding your brain and spinal cord. When the infection reaches the central nervous system, it causes coccidioidal meningitis, a serious condition requiring immediate, specialized medical intervention.

How Doctors Diagnose Valley Fever.

When you visit a doctor with persistent respiratory signs, they will review your travel history, daily activities, and physical symptoms. To confirm a diagnosis of Valley fever, they typically order specific medical evaluations:

• Blood Tests: Laboratory screening checks your blood for specific antibodies or antigens linked to the Coccidioides fungus.
• Imaging Tests: A chest X-ray or CT scan lets your doctor look inside your chest to check for signs of pneumonia, lung nodules, or cavities.
• Biopsy or Culture: In some instances, doctors examine a small sample of tissue or fluid under a microscope to confirm the presence of the fungus.

Treatments for Valley Fever.

Treatment depends entirely on how severe your infection is. For mild cases with few symptoms, doctors may recommend a cautious approach known as watchful waiting. Your body fights off the infection naturally while your care team monitors your recovery closely.

If your infection is more advanced, persistent, or if you belong to a high-risk group, your doctor will prescribe antifungal medicines. Common treatment options include:

• Fluconazole taken orally.
• Itraconazole for specific types of lung or tissue lesions.
• Amphotericin B given through an intravenous line for severe, widespread infections.

Treatment courses often last anywhere from three to six months, or longer if complications develop.

When to See a Doctor.

If you live in or recently visited an area where these fungi are common, and you experience a flu-like illness lasting longer than one week, schedule an appointment with a doctor right away.

Can Valley Fever Be Prevented?

Preventing exposure to microscopic soil spores is difficult if you live in an endemic area. However, you can lower your risk with these practical steps:

• Stay indoors with windows closed during heavy dust storms.
• Use high-efficiency particulate air (HEPA) filters in your home ventilation system.
• Avoid disturbing loose dirt, gardening soils, or construction sites without protection.
• Wear a properly fitted N95 respirator mask whenever you do outdoor work that stirs up dust.

What to Expect If You Get Valley Fever.

Most people recover fully without lasting health issues. A small group of people experience prolonged fatigue or lingering coughs that can take many months to resolve completely. Serious or fatal complications remain very rare. With timely medical care and proper antifungal therapy when needed, most patients return to their normal daily lives.

How Long Does Valley Fever Last?

Acute symptoms usually improve within a few weeks to several months. For a small number of people, the infection settles into a chronic form of lung disease. Chronic pulmonary coccidioidomycosis features persistent chest pain, ongoing cough, and occasional blood-tinged mucus. These chronic cases require ongoing supervision by a doctor.

Can You Get Valley Fever a Second Time?

Once you recover from Valley fever, your immune system typically builds strong protection against future infections. Getting the condition a second time is uncommon.

Can You Remove the Fungus From Your Yard?

The Coccidioides spores are microscopic and widespread in regional soils. Trying to clear them from a residential yard or garden is practically impossible. If you do not live in an endemic region, you do not need to worry about soil contamination around your home.