Apis mellifera Filamentous Virus (AmFV)
AmFV is a large double stranded DNA virus . The virus is commonly found in the gut of bees with no overt signs of infection. It has been previously suggested that AmFV replication could be associated with Black queen cell virus (BQCV) and with N. apis infections.

It does not seem to be a particularly virulent virus.

A major diagnostic feature of AmFV infection is that the haemolymph of severely infected adult honeybees becomes milky-white
The Apis mellifera Filamentous Virus Genome
Scientific Beekeeping
Dynamics of Apis mellifera Filamentous Virus (AmFV) Infections in Honey Bees and Relationships with Other Parasites