Human infections with Dermatophilus sp.: travel-associated first case and a local cluster in the context of emerging European outbreaks, Basel, Switzerland, 2025 to 2026.

We report six human Dermatophilus infections diagnosed in Basel between May 2025 and March 2026. The travel-associated first case developed a pustular rash and conjunctivitis after a stay in Thailand. A second imported case occurred after travel to Indonesia. Four subsequent locally acquired cases presented with genital or inguinal folliculitis-like lesions without reported animal contact. Whole-genome sequencing placed all isolates in a monophyletic cluster within the D. congolensis_A lineage, supporting possible human-to-human transmission. Enhanced surveillance and molecular diagnostics are warranted.