Rare Fungal STD Spreads Across U.S., With Minnesota Hit Hardest

A sexually transmitted fungal infection is spreading across the U.S., with Minnesota reporting the largest outbreak in the region. The fungus, known as Trichophyton mentagrophytes genotype VII (TMVII), has now reached at least three states, raising concerns among health officials. The CDC has classified it as an emerging threat due to its resistance to common treatments.

The first U.S. case of TMVII appeared in New York in June 2025. By February 2026, the CDC confirmed 12 infections across Minnesota, New York, and California. Most cases involved men who had sexual contact with infected partners or travelled to South Asia.

Minnesota alone has recorded over 30 infections, making it the hardest-hit state. The fungus, which is not a worm, causes itchy and painful skin lesions in the genital, perianal, and abdominal areas. Treatment can last up to 12 weeks, creating difficulties for patients and healthcare providers.

Health officials warn that the infection has also spread in China and Europe, primarily among men who have sex with men. Some cases in the U.S. were linked to travellers who visited Thailand and had sexual contact with sex workers. To prevent further transmission, infected individuals are advised to avoid sexual activity and not share personal items or clothing.

The outbreak of TMVII continues to grow, with cases now confirmed in multiple states and countries. Health authorities stress the importance of early detection and prolonged treatment to control its spread. The CDC's classification of TMVII as an emerging threat highlights the need for increased vigilance and public awareness.