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Background  To date there has been no evidence of mosquito-borne virus transmission of public health concern in the UK, despite the occurrence of more than 30 species of mosquito, including putative vectors of arboviruses. The saltmarsh mosquito  Ochlerotatus detritus  [syn.  Aedes  ( Ochlerotatus )  detritus ] is locally common in parts of the UK where it can be a voracious feeder on people.    Methods  Here, we assess the competence of  O. detritus  for three major arboviruses: dengue virus (DENV), chikungunya virus (CHIKV) and West Nile virus (WNV) using adult mosquitoes reared from wild, field-obtained immatures.    Results  We demonstrate laboratory competence for WNV at 21 °C, with viral RNA detected in the mosquito’s saliva 17 days after oral inoculation. By contrast, there was no evidence of laboratory competence of  O. detritus  for either DENV or CHIKV.    Conclusions  To our knowledge, this is the first study to demonstrate competence of a UK mosquito for WNV and confirms that  O. detritus  may present a potential risk for arbovirus transmission in the UK and that further investigation of its vector role in the wild is required.

Evaluation of the vector competence of a native UK mosquito Ochlerotatus detritus (Aedes detritus) for dengue, chikungunya and West Nile viruses