Unexpectedly aggressive human-biting behaviour of Hippobosca equina Linnaeus (Diptera: Hippoboscidae).
Jozef Oboňa, Iveta Tomášeková, Ľudmila Juhásová et al.
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Case in brief
A person in Slovakia was bitten by a parasitic forest fly identified as Hippobosca equina. The fly showed atypically aggressive behaviour toward the human host. Molecular analysis of the single specimen responsible for the bite detected DNA of Bartonella schoenbuchensis, a zoonotic bacterium. The report raises the possibility that H. equina can pose a human health concern, but detection of bacterial DNA in the fly does not establish transmission to the person or demonstrate that the fly is a competent vector.
What made this case unusual
The report documents a confirmed human bite by H. equina in Slovakia, with unusually aggressive behaviour; the biting specimen also contained B. schoenbuchensis DNA.
Diagnostic / clinical pearl
A human bite by H. equina should prompt accurate identification of the fly; finding pathogen DNA in the specimen indicates potential exposure, not proven transmission or vector competence.
Why it matters
The authors highlight possible human exposure in natural and recreational settings, particularly during hot, windless conditions that may increase fly activity.