Minnesota health authorities have confirmed an outbreak of a contagious fungal skin infection caused by Trichophyton mentagrophytes genotype VII (TMVII), the same fungus responsible for ringworm. The Minnesota Department of Health (MDH) reports 14 confirmed cases and 27 suspected cases since the first infection was identified in July 2025.

The infection spreads primarily through direct skin-to-skin contact, including sexual activity, as well as via contaminated objects and surfaces such as shared towels or communal bathing facilities. Todd Wills, MD, professor of internal medicine at the University of South Florida Morsani College of Medicine, noted that TMVII is the only recognized fungal sexually transmitted disease. Individuals with a history of sexually transmitted infections are considered at higher risk.

Symptoms typically include round, red, itchy rashes that can be painful and resistant to over-the-counter antifungal treatments. Diagnosis may require a skin scraping for lab confirmation, though doctors often begin treatment before results are available. Infections can be more severe in immunocompromised individuals and may lead to scarring or secondary infections if untreated.

Health officials emphasize careful hygiene practices to limit the spread, including avoiding close skin contact when symptomatic, refraining from sharing towels or linens, and thoroughly sanitizing bathing areas. Antifungal medications currently in use appear effective, though treatment often requires prescription pills over several weeks.

MDH has established enhanced surveillance to track cases and urges healthcare providers to report any suspected infections for lab testing. Authorities advise anyone experiencing symptoms to seek immediate medical care.