Results of virus assays for bumblebees, honeybees, and flowers.

Virus loads are presented as the observed range of viral genome copies. Prevalence % is the percentage of samples positive for a virus. Prevalence % (-) is the percentage of bees in which we detected the negative virus strand, indicative of a replicating infection. Site type ‘No Apis’ are sites without apiaries and with no honeybees observed during sampling.