Judy Chen writes in her extensive chapter on "Honey Bee Viruses" this:
> Vector-borne transmission is an indirect route of horizontal transmission
and involves an intermediate biological host, a vector, which acquires and
transmits viruses from one host to another.
> Since the varroa mite has been proven to be an effective vector in
transmitting and activating viruses, timely and efficient control of the
varroa mite population will reduce the incidence of viral diseases.
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