Inside America's biggest ever fungus outbreak that sickened hundreds

Health officials are warning about a little-known deadly fungus that caused the biggest fungal outbreak in US history.

Last February, 162 workers at Billerud Paper in were sickened with blastomycosis, an infection caught by inhaling spores from the fungus Blastomyces.

Of those, 18 workers were hospitalized with scarring on their lungs that made it difficult to breathe. One patient died.

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