Deformed wing virus (DWV), notorious for its virulence in the western honey bee (Apis mellifera) when vectored by ectoparasitic mite Varroa destructor, is also widespread among wild bumble species, presumably through spillover from bees. Experimental studies on of DWV Bombus spp. have provided equivocal results and until now been confined to bees under laboratory conditions. Here, we inoculated...