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A Model for Experimental Exposure of Humans to Larval Ixodes scapularis Ticks
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[Fatal tick-borne encephalitis].

Tapani Tikkakoski1, Tadeusz Kaminski, Sinikka Ingo

  • 1Keski-Pohjanmann erikoissairaanhoito- ja peruspalveluntayhtymä, radiologian osasto, Kokkola.

Duodecim; Laaketieteellinen Aikakauskirja
|June 24, 2011
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Summary

Tick-borne encephalitis cases are rising in Europe. This study details the first fatal case in Finland transmitted by the taiga tick (Ixodes persulcatus), a species previously unrecorded in Western Europe.

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Area of Science:

  • Neurology
  • Infectious Diseases
  • Epidemiology

Background:

  • Tick-borne encephalitis (TBE) incidence has risen in Europe since the 1990s, with expanding endemic areas.
  • The taiga tick (Ixodes persulcatus) is a known vector for TBE virus, primarily in Eastern Europe and Asia.
  • Recent findings indicate the presence of Ixodes persulcatus along the Finnish west coast.

Observation:

  • Ixodes persulcatus, the taiga tick, has been identified in Finland, specifically along the Närpiö-Simo axis.
  • This tick species was previously not documented in other regions of Western Europe.
  • The taiga tick in the Kokkola archipelago has been found to transmit the Siberian subtype of the tick-borne encephalitis virus.

Findings:

  • This report documents the first fatal case of tick-borne encephalitis in Finland.
  • The transmission of the virus in this fatal case was attributed to the taiga tick (Ixodes persulcatus).
  • This marks a significant finding regarding the geographic range and vector capacity of Ixodes persulcatus in Europe.

Implications:

  • The presence and vector competence of Ixodes persulcatus in Finland suggest a potential expansion of TBE risk in Western Europe.
  • This case highlights the need for enhanced surveillance and public health awareness regarding tick-borne diseases in newly endemic regions.
  • Further research is warranted to understand the ecological dynamics and public health impact of Ixodes persulcatus in Finland and surrounding areas.