Rare Fungal STD Spreads Rapidly in Minnesota, Resists Treatment

A sexually transmitted fungal infection is spreading rapidly in Minnesota, with over 30 confirmed cases. The U.S. Centers for Disease Control and Prevention (CDC) has now classified the fungus, Trichophyton mentagrophytes genotype VII (TMVII), as an emerging threat. Health officials warn that the infection is difficult to treat and can take months to clear.

The outbreak began in June 2025 when a man in New York became the first documented U.S. case. Since then, TMVII has spread, with Minnesota reporting the largest cluster of infections by February 2026. Cases have also appeared in China and Europe, mostly among men who have sex with men.

The fungus spreads through skin-to-skin contact and causes painful, itchy lesions in the genital, perianal, and abdominal areas. Many infections have been traced back to travellers who had sexual contact with sex workers in Thailand.

TMVII is resistant to common antifungal treatments, often requiring up to 12 weeks of therapy. To prevent further spread, health officials urge infected individuals to avoid sexual contact and not share personal items or clothing. Washing and drying clothes at high temperatures is also recommended to kill fungal spores.

The CDC's classification of TMVII as an emerging threat highlights the growing concern over its spread. With cases now reported across multiple continents, health authorities continue to monitor the situation closely. Prevention measures remain critical to controlling the outbreak.