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Colony collapse disorder (CCD) is characterized by the unexplained losses of large numbers of adult worker bees ( Apis mellifera ) from apparently healthy colonies. Although infections, toxins, and other stressors have been associated with the onset of CCD, the pathogenesis of this disorder remains obscure. Recently, a proteomics study implicated a double-stranded DNA virus, invertebrate iridescent virus (Family  Iridoviridae ) along with a microsporidium ( Nosema  sp.) as the cause of CCD. We tested the validity of this relationship using two independent methods: (i) we surveyed healthy and CCD colonies from the United States and Israel for the presence of members of the  Iridovirus  genus and (ii) we reanalyzed metagenomics data previously generated from RNA pools of CCD colonies for the presence of  Iridovirus -like sequences. Neither analysis revealed any evidence to suggest the presence of an  Iridovirus  in healthy or CCD colonies.

Lack of Evidence for an Association between Iridovirus and Colony Collapse Disorder