The virus that causes encephalitis belongs to the arbovirus group. The virus enters the human body through a tick bite. It is impossible to get directly infected with tick-borne encephalitis. The disease causes long-term immune response that lasts throughout the life of the affected person. The reservoir of the virus is small animals living in the taiga (forest mice, chipmunks, hedgehogs) and birds (chips, thrushes, finches).Of the domestic animals are most susceptible to goat disease.