Blastomycosis, or “blasto” is a fungal infection caused by the naturally occurring fungus, blastomyces. Although the disease is not common, there are several Lincoln County residents that are diagnosed every year with blasto. You can get blasto by breathing in air around dirt that has been disturbed. Pay special attention when soil is:
- Near a water source (lake or river) and has been disturbed.
- Moved by gardening, camping, hunting, hiking, riding all-terrain vehicles, or cleaning brush.
- Near an excavation or construction site.
Signs and Symptoms
Symptoms of blasto develop 2-15 weeks after being exposed with blastomyces. Symptoms may include:
- Cough
- Fever or chills
- Shortness of breath
- Chest or back pain
- Feeling very tired
- Skin sores that may look crusted and growing in size
Risk and Prevention
About half of people infected will not have any symptoms. People with a weakened immune system or a chronic illness are more likely to show symptoms.
The best way to avoid serious illness:
- Talk to your healthcare provider when experiencing any symptoms. Blasto is treatable with antifungal medications.
- If you have been diagnosed with pneumonia, tell your healthcare provider if you may have been exposed to blasto.
- People who have weakened immune systems may want to consider avoiding activities that involve disrupting the soil.
Resources
- WI Department of Health Services
- Centers for Disease Control and Prevention
- Marshfield Clinic Blastomycosis Infographic
Last Updated: 2/23/2026