Varroa-Virus Interaction in Collapsing Honey Bee Colonies
In colonies where varroa treatment reduced the mite load, colonies overwintered successfully, allowing the mites and viruses to be carried over with the bees into the next season. In general, AKI and DWV titres did not show any notable response to the treatment and steadily increased over the season from April to October. In the untreated control group, titres increased most dramaticall.
http://www.plosone.org/article/info%...l.pone.0057540