Also, inapparent infections by iridescent viruses may involve a low density of IIV particles in infected host cells [46], so without sensitive techniques such as MSP, it is not surprising that infections in CCD bee colonies were previously missed. (journals.plos.org)
Inapparent infections may not be lethal, but may affect the reproduction and longevity of covertly infected hosts [42]. (journals.plos.org)
Patent IIV infections are almost invariably lethal but inapparent or covert infections may be common [29], [34]. (journals.plos.org)