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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
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View Affiliations Hide AffiliationsCorrespondence:Peter Michael Kellerpetermichael.keller usb.ch
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Citation style for this article: . 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. Euro Surveill. 2026;31(29):pii=2600552. https://doi.org/10.2807/1560-7917.ES.2026.31.29.2600552 Received: 29 Jun 2026; Accepted: 22 Jul 2026
Abstract
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.
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