Sexually Transmitted Ringworm Hits Minnesota in ’Largest Known Outbreak’

Minnesota health officials are currently investigating what they’ve described as the “largest known outbreak” of a sexually transmitted infection. More than 30 individuals have been affected by a specific strain of ringworm, known as Trichophyton mentagrophytes genotype VII (TMVII).

Understanding the Outbreak

This outbreak, first identified in the U.S. In June 2025 with a case in New York, is caused by a fungus – despite its common name, ringworm is not caused by a worm. The Minnesota Department of Health issued an advisory on February 11th regarding the surge in cases of TMVII, which manifests as “itchy, painful, and/or persistent genital, perianal, buttock or abdominal skin lesions.”

Did You Know? Treatment for this specific strain of ringworm, TMVII, can require up to 12 weeks to resolve.

The U.S. Centers for Disease Control describes TMVII as an “emerging fungus” initially observed in travelers returning from Thailand after sexual contact with sex workers. It has since been documented in China and Europe, and within the United States, appears to be primarily affecting men who have sex with men.

Why This Matters

The emergence of this drug-resistant fungal infection highlights the evolving landscape of sexually transmitted infections. The outbreak in Minnesota, with over 30 confirmed or suspected cases, represents a significant increase in reported TMVII infections within the country. The potential for misdiagnosis is also a concern, as the rash associated with TMVII can resemble other skin conditions like eczema or psoriasis.

Expert Insight: The identification of this emerging fungal infection underscores the importance of vigilance in sexual health and the need for accurate diagnosis to ensure appropriate treatment and prevent further spread.

Health officials are urging those infected to abstain from sexual contact and avoid sharing personal items, including clothing. Thorough washing and drying of clothing on high heat are recommended to eliminate fungal spores.

What Could Happen Next

If the outbreak continues to expand, public health officials may consider broader awareness campaigns to educate the public about TMVII, its symptoms, and prevention methods. Further research could be initiated to better understand the transmission dynamics of the fungus and to develop more effective treatment strategies. It is also possible that healthcare providers will be encouraged to increase their vigilance in recognising and testing for TMVII, particularly in individuals presenting with relevant symptoms.

Frequently Asked Questions

What are the symptoms of TMVII?

TMVII causes “itchy, painful, and/or persistent genital, perianal, buttock or abdominal skin lesions.”

How is TMVII spread?

TMVII is spread through skin-to-skin contact, specifically through sexual contact.

Can TMVII be mistaken for other conditions?

Yes, the rash associated with TMVII can be mistaken for other skin conditions, such as eczema or psoriasis.

What steps can individuals take to protect themselves and others from this emerging health concern?