Kakugo Virus (KV)
KV is a member of the dicistroviridae family, order Picornavirales and is a subtype of Deformed Wing Virus (DWV).

The Kakugo (Japanese for 'ready to attack') virus, when resident in a bee's brain, can contribute to aggressive behaviors such as are preeminent during a bee's guard phase in their life cycle. Kakugo is the first virus to have been found to cause aggressive behavior, although because the virus was only recently discovered to have such effects, research into the matter is limited.

It is considered a subtype of the DWV species. It is found only in the mushroom bodies of aggressive, guard honeybees.
Novel Insect Picorna-Like Virus Identified in the Brains of Aggressive Worker Honeybees
Scientific Beekeeping