Tick-borne encephalitis virus is the virus associated with Tick-borne encephalitis.

The responsible virus, Tick-Borne Encephalitis Virus (TBEV), is a member of the genus Flavivirus

Flavivirus

Flavivirus is a genus of the family Flaviviridae. This genus includes the West Nile virus, dengue virus, tick-borne encephalitis virus, yellow fever virus, and several other viruses which may cause encephalitis....

. Other close relatives include Omsk hemorrhagic fever

Omsk hemorrhagic fever

Omsk Hemorrhagic Fever is a viral hemorrhagic fever caused by a Flavivirus.It is found in Siberia. It is named for an outbreak in Omsk.-Virology:...

 virus, Kyasanur forest disease

Kyasanur forest disease

Kyasanur forest disease is a tick-borne viral hemorrhagic fever endemic to South Asia. The disease is caused by a virus belonging to the family flaviviridae, which also includes yellow fever and dengue fever.-History:...

 virus, Alkhurma virus

Alkhurma virus

Alkhurma virus is a member of the Flaviviridae virus family .-Virology:The virus has a positive sense single stranded RNA genome and replicates in the cytoplasm of the infected host cell...

, Louping ill virus and the Langat virus

Langat virus

Langat virus is a virus of the genus Flavivirus. For the first time Langat virus was isolated in Malaysia and Thailand. This virus is close to Omsk hemorrhagic fever virus, Kyasanur forest disease virus, Alkhurma virus, Louping ill virus and the Tick-borne encephalitis virus.The Langat virus does...

.

TBE virus has three subtypes:
(a) Western European subtype (formerly Central European encephalitis virus, CEEV; principal tick vector: Ixodes ricinus

Ixodes ricinus

Ixodes ricinus, the castor bean tick, is a chiefly European species of hard-bodied tick. It may reach a length of when engorged with a blood meal, and can transmit both bacterial and viral pathogens such as the causative agents of Lyme disease and tick-borne encephalitis.-Description:In common...

);
(b) Siberian subtype (formerly West Siberian virus; principal tick vector: Ixodes persulcatus);
(c) Far Eastern subtype (formerly Russian Spring Summer encephalitis virus, RSSEV; principal tick vector: Ixodes persulcatus).

The reference strain is the Sofjin strain.