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Volume 12, Number 10—October 2006

Siberian Subtype Tickborne Encephalitis Virus, Finland

Anu Jääskeläinen*Comments to Author , Tapani Tikkakoski†, Nathalie Uzcátegui*, Andrey Alekseev‡, Antti Vaheri*§, and Olli Vapalahti*§¶
Author affiliations: *Haartman Institute, University of Helsinki, Helsinki, Finland; †Keski-Pohjanmaa Central Hospital, Kokkola, Finland; ‡Russian Academy of Sciences, St. Petersburg, Russia; §HUSLAB Hospital District of Helsinki and Uusimaa, Helsinki, Finland; ¶Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland

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Table 1

Tick collection sites in Kokkola Archipelago, June 2004*

Location TBE case-patient, sex/age/y No. ticks (n/f/m) No. tick pools Tick pools positive in RT-PCR† Tick pools positive in virus isolation†
1 M/48/2004 (12) 184 (19/87/78) 19 4, 8, 9 8, 9
2 M/21/2002 (11) 80 (24/25/31) 8 25, 26 25, 26
3 F/24/2002 (11) 158 (2/87/69) 16 39 39
4 F/12/2002 (11) 474 (16/227/231) 48 79, 81, 84, 85, 86, 102, 118 79, 81, 84, 86, 102, 118
5 F/73/2002 (11) 41 (2/22/17) 5 ND
6 M/6/2003 166 (6/83/77) 17 ND
7 M/7/2003 6 (0/3/3) 1 ND
8 No known cases 55 (1/25/29) 6 ND
9 No known cases 9 (2/5/2) 1 ND
10 No known cases 8 (0/6/2) 1 ND

*TBE, tickborne encephalitis; RT-PCR, reverse transcription–polymerase chain reaction; n, nymphs; f, adult females; m, adult males; ND, not determined.
†Nos. indicate the tick pool numbers, the same as used in the phylogenetic tree.

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