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Bees that are seen to tremble uncontrollably and are unable to fly may be exhibiting signs of either Chronic Bee Paralysis Virus (CPV) or Acute Bee Paralysis (APV). They also lose their hair giving them a greasy look and they are submissive to attack (unlike robber bees who may have a similar appearance).

There is no known treatment for these viruses. Some research indicates that susceptibility to these viruses may be genetically linked. Requeening or adding frames of sealed brood from a healthy hive may help.

Maintain healthy colonies and requeen on a regular basis.