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Volume 7, Number 3—June 2001

Dispatch

Risk for Human Tick-Borne Encephalitis, Borrelioses, and Double Infection in the Pre-Ural Region of Russia

Edward I. Korenberg*Comments to Author , Lidiya Ya. Gorban'†, Yurii V. Kovalevskii*, Vladimir I. Frizen†, and Andrei S. Karavanov‡
Author affiliations: *Gamaleya Research Institute for Epidemiology and Microbiology, Russian Academy of Medical Sciences, Moscow, Russia; †Perm Center of State Sanitary-Epidemiologic Inspection, Perm, Russia; ‡Chumakov Institute of Poliomyelitis and Viral Encephalites, Russian Academy of Medical Sciences, Moscow, Russia

Main Article

Table 2

Prevalence of infection by tick-borne encephalitis virus (%) in unfed adult Ixodes persulcatus ticks collected from vegetation and removed from humans

Ticks collected from vegetation
Ticks removed from humans
Year No. Prevalence of infection (p ± 2mp) No. Prevalence of infection (p ± 2mp)
1994 664 21.5 ± 3.2 9,815 9.5 ± 0.6
1995 265 10.9 ± 3.8 8,523 5.5 ± 0.5
1996 167 35.3 ± 7.4 17,905 11.0 ± 0.5
1997 336 38.7 ± 5.3 12,443 8.8 ± 0.5
1998
244
15.2 ± 4.6
14,129
8.4 ± 0.5
Total 1,676 23.7 ± 2.1 62,816 9.0 ± 0.2

±2mp = confidence interval based on double sampling error; Coefficient of correlation was r = 0.7.

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