TRANSMISSION

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This biting insect is a Culicoides midge (magnified many times). It is the vector of both BTV and EHDV. In the United States, Culicoides sonorensis (formerly C. variipennis sonorensis) is a confirmed vector of BTV and EHDV and C. insignis is a confirmed vector of BTV. It is possible that other species may eventually be confirmed as competent vectors in the United States.

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