Blastomycosis -

Northern Wisconsin and Minnesota have some of the highest reported incidences, sometimes exceeding 100 cases per 100,000 people during outbreaks.

Primarily found in North America, specifically the Ohio and Mississippi River valleys, the Great Lakes region, and the St. Lawrence Seaway.

The fungus thrives in moist, acidic soil and decaying organic matter (wood and leaves), particularly near waterways.

Adult males are more frequently affected, likely due to higher occupational and recreational exposure to outdoor environments. Clinical Manifestations Blastomycosis - StatPearls - NCBI Bookshelf