Could a Hidden Fungus in the Soil Be Causing Your Persistent Cough? Learn About Blastomycosis

We all love spending time outdoors in nature, but our environment sometimes holds tiny, hidden hazards. One such risk is a microscopic fungus called Blastomyces, which can cause an infection known as blastomycosis when inhaled into your lungs.

This illness often starts out feeling like a common cold or flu, but it can sometimes spread from your lungs to other parts of your body. Learning about the signs, causes, and treatments helps you stay safe and seek the right medical care quickly.

What Is Blastomycosis? Simply Put...

Put simply, blastomycosis is an infection that happens when you breathe in spores of the Blastomyces fungus. This fungus lives mostly in moist soil and rotting wood, especially near rivers, lakes, and damp forest floors.

Unlike large mushrooms you see in the forest, these fungal spores are far too small to see with your naked eye. When you dig in the dirt or disturb dry dust in these areas, the microscopic spores float into the air and enter your lungs.

Historically, doctors sometimes referred to this condition as Gilchrist disease or Chicago disease. While the name has changed, the underlying cause remains the same.

What Are the Common Symptoms?

Blastomycosis symptoms can vary greatly from person to person. Surprisingly, many people who breathe in the fungus never develop any symptoms at all. Studies suggest that up to half of infected people experience no illness.

If symptoms do appear, they usually mimic other common respiratory infections. Look out for the following signs:

• A persistent fever that does not go away.
• Chills and shaking episodes.
• Frequent fatigue and low energy.
• A nagging cough that lasts for weeks or months.
• Shortness of breath or tightness in your chest.
• Muscle aches and joint pain.
• Coughing up blood or bloody mucus in severe cases.
• Heavy sweating, especially at night.
• Skin sores, bumps, or blisters.

What Do Blastomycosis Skin Sores Look Like?

Sometimes the fungal infection spreads from your lungs through your bloodstream to your skin, a condition medically known as Blastomyces dermatitidis. When this happens, skin lesions can take several different visual forms.

• Raised bumps or firm nodules on the skin surface.
• Growths that resemble common warts.
• Open sores that may look like ulcers.
• Large, open wounds or tightly clustered bumps.
• Lesions that often develop crusts, scabs, or flaking skin layers.

If you notice unusual skin changes alongside a fever or cough, talk to your doctor right away for a proper evaluation.

Why Does Blastomycosis Happen? The Causes.

The primary cause of this condition is exposure to specific fungi belonging to the Blastomyces genus. Among them, Blastomyces dermatitidis (and closely related species) is the most frequent culprit behind human infections.

The fungus thrives in specific geographic regions with damp, organic-rich environments. While cases occur globally, they are most often reported in parts of North America:

• The Midwestern United States, especially in states like Wisconsin and Minnesota.
• The South Central and Southeastern United States.
• Southeastern Canada, including Ontario, Quebec, Manitoba, and Saskatchewan.
• Occasional cases also appear in the Northeastern United States.

Even if you live outside these high-risk areas, travelers or outdoor workers visiting these regions should remain aware of potential environmental exposures.

How Do You Catch Blastomycosis?

You contract blastomycosis solely by inhaling airborne fungal spores released from disturbed damp soil or rotting wood. Once inside your lungs, the spores begin to multiply.

In some cases, the infection stays localized in your lungs. This in others it travels through your bloodstream to other organs. Large construction projects, digging, or landscaping activities that disturb large amounts of soil have sometimes caused outbreaks among groups of people.

Important note: Blastomycosis is not contagious between people. You cannot catch the infection by talking to, touching, or living with someone who has the illness.

Who Is at Higher Risk?

Anyone living in or visiting areas where the fungus is common can potentially develop blastomycosis. However, certain activities and health statuses increase your overall risk.

• Jobs or hobbies that involve disturbing soil or spending time near waterways: .
• Construction workers and landscapers.
• Hunters and campers.
• Fishermen and outdoor hikers.
• Veterinarians, on rare occasions, if they accidentally encounter contaminated needles or animal lesions.

also, certain people face a higher risk of developing severe complications or advanced illness if infected:

• People with weakened immune systems, such as those with HIV or people taking immunosuppressive drugs.
• people with chronic lung conditions like chronic obstructive pulmonary disease (COPD).
• Adults over the age of 50.

What Complications Can Occur?

If left untreated or if the infection is severe, blastomycosis can lead to serious medical complications. The most dangerous immediate risk is Acute Respiratory Distress Syndrome (ARDS), which makes breathing extremely difficult.

also, the fungus can spread beyond the lungs to affect other body systems:

• Skin: Resulting in chronic sores and disfiguring lesions.
• Bones and joints: Causing painful bone infections, swelling, and reduced mobility.
• Central nervous system: Spreading to the brain or spinal cord, which requires immediate, intensive medical intervention.

How Do Doctors Diagnose Blastomycosis?

If your doctor suspects blastomycosis, they will review your symptoms, medical history, and recent travel or outdoor activities. To confirm the diagnosis, they may order specific lab tests:

• Collecting samples of your blood, urine, or sputum (mucus coughed up from your lungs).
• Taking a small tissue sample (biopsy) from any visible skin sores.

Laboratories analyze these samples using several specialized methods:

• Fungal culture: Growing the fungus from clinical samples is the gold standard for confirmation, though results can take several weeks.
• Microscopic and molecular testing: Using techniques like PCR to detect fungal DNA or identifying typical yeast cells under a microscope.
• Antigen and antibody tests: Checking your blood or urine for signs of the fungus or your immune system's response to it.

Imaging tests, such as chest X-rays or CT scans, are also standard practice to assess the extent of infection in your lungs.

How to Suspect Blastomycosis Yourself.

Because blastomycosis symptoms closely resemble regular pneumonia or bacterial infections, recognizing it can be challenging. However, you should consider this possibility if:

• You have persistent fever, cough, and breathing trouble that do not improve after taking standard antibiotic medicines.
• You live in or have recently traveled to an area known for Blastomyces fungi.
• Your hobbies or occupation involve working closely with soil, dirt, or wooded outdoor environments.

Sharing these specific details with your doctor helps them test for fungal infections rather than just standard bacterial pneumonia.

What Are the Treatments?

Doctors treat blastomycosis using prescription antifungal medicines. The primary drugs prescribed depend on how severe the infection is:

• Amphotericin B: Typically reserved for severe or rapidly worsening infections that require intravenous delivery.
• Itraconazole: An oral pill used for mild to moderate infections or as follow-up therapy after initial intravenous treatment.

In some severe cases, doctors may also prescribe corticosteroids to help reduce dangerous inflammation in the lungs or other tissues.

What Happens During Treatment and Recovery?

It is vital to understand that blastomycosis rarely resolves on its own. You must take prescription antifungal medicines to clear the infection.

While standard cases require treatment for several weeks, more severe infections can necessitate medicine for six months to a year or even longer. Extended treatment is especially necessary if:

• The infection is widespread or severe at diagnosis.
• The fungus has spread from your lungs to your bones, skin, or brain.
• You have an underlying chronic lung condition or a compromised immune system.

Following your doctor's exact schedule and completing the full course of medicine is crucial to prevent the infection from returning.

What Is the Survival Rate?

The good news is that with prompt diagnosis and proper antifungal treatment, the vast majority of people—over 90%—recover successfully.

However, delays in treatment or having severe underlying health issues can increase the risk of life-threatening complications. Early detection remains your best protection for a full recovery.

When Should You See a Doctor?

Schedule an appointment with your doctor if you experience:

• Cold or flu-like symptoms that persist for more than a week without improvement, or symptoms that steadily worsen.
• A lingering cough and fever after a trip to a region where fungal infections are common, or if your job involves heavy soil exposure. Be sure to mention these details to your provider.

What Questions Should You Ask Your Doctor?

Preparing questions for your medical visit helps ensure you understand your health status. Consider asking:

• Am I at a higher risk for severe blastomycosis based on my health history?
• Are there specific precautions I should take during my outdoor activities?
• How should I correctly take my prescribed antifungal medicine, and what side effects should I watch for?
• What warning signs mean I should contact your office or go to the hospital right away?

How Can You Prevent Blastomycosis?

Completely avoiding Blastomyces spores is difficult if you live in an endemic area. However, you can reduce your exposure risk with a few practical habits:

• Avoid unnecessary digging in damp soil or disturbing large piles of rotting wood and dust, especially near water sources.
• Wear an N95 or KN95 respirator mask if your job or hobbies require you to handle soil, mulch, or dusty environments where fungal spores may become airborne.

Can the Fungus Live Inside Homes?

Generally, the fungus does not grow or thrive inside indoor living spaces. It requires damp outdoor soil and rotting organic matter to multiply.

While you might sometimes track small amounts of outdoor dirt inside on your shoes or clothing, standard household cleaning and washing clothes effectively remove this residual debris.

Final Thoughts to Remember.

Fresh air and outdoor exploration offer incredible benefits, but nature's microscopic organisms sometimes cross paths with our respiratory systems. Blastomycosis is a treatable condition when caught early by a qualified medical professional.

Always share your travel history and outdoor hobbies with your doctor if you experience persistent cold or flu-like symptoms that do not resolve. Prompt diagnosis stops the fungus from spreading and ensures a full, healthy recovery. Stay informed, stay safe, and take care of your health!