Chronic Bee Paralysis Virus
CBPV type 1 may be confused with poisoning and is most common in spring and summer. A mass of dead or dying bees may be seen at the entrance.
Type 2 is more rarely seen in the UK. The shiny, hairless black bee may be nibbled by the other bees and prevented from entering the hive by the guard bees. Initially it can fly but looses this abilty within 2-3 days.