Fatal Tick-Borne Encephalitis Virus Infections Caused by Siberian and European Subtypes, Finland, 2015

Emerg Infect Dis. 2018 May;24(5):946-948. doi: 10.3201/eid2405.171986.


In most locations except for Russia, tick-borne encephalitis is mainly caused by the European virus subtype. In 2015, fatal infections caused by European and Siberian tick-borne encephalitis virus subtypes in the same Ixodes ricinus tick focus in Finland raised concern over further spread of the Siberian subtype among widespread tick species.

Keywords: Encephalitis; Finland; TBEV; flavivirus infections; meningitis/encephalitis; tick-borne encephalitis virus; tickborne; vector-borne infections; viruses; zoonoses.

Publication types

  • Case Reports
  • Letter
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Animals
  • Encephalitis Viruses, Tick-Borne / genetics*
  • Encephalitis, Tick-Borne / epidemiology*
  • Encephalitis, Tick-Borne / virology*
  • Fatal Outcome
  • Female
  • Finland / epidemiology
  • Humans
  • Male
  • RNA, Viral / genetics
  • RNA, Viral / isolation & purification
  • Ticks / virology


  • RNA, Viral