< The team found the transmission route used by the Varroa mite selects against viruses that are much more virulent than the Deformed Wing Virus, such as Sacbrood virus and Black queen cell virus. These viruses normally suppress Deformed Wing Virus. The elimination of Sacbrood and Black Queencell virus leaves just Deformed Wing Virus, which does not kill the bees..>

I believe the author of the "summary" may have cut some corners saying DWV does "not kill the bees" (or it's very likely I am just totally confused...

More to the point, from the paper:  < The arrival of V. destructor quickly selects for an increase in the prevalence of the most virulent viruses until they become so virulent their transmission grinds to a halt owing to the death of the brood and thus the mites. Now more benign viruses such as DWV can make their appearance. Hence, instead of V. destructor directly causing a change in virulence of DWV, DWV is simply more favourable to the mite’s lifecycle and therefore given the upper hand after more virulent species have been selected against. >

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