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- W2015336393 abstract "Knowledge concerning the prevalence of the tick-borne encephalitis virus (TBEV) in wild living tick populations is very important for understanding the epidemiology of the disease and for immuno prophylactic strategy. In Germany high and low risk areas of TBE exist. In the years 1997-2000, 533 autochthonous clinical TBE cases were recorded, in the high-risk areas of Bavaria and Baden-Wuerttemberg 140 and 363, and in the low risk areas in Hesse (Odenwald) and Rhineland-Palatinate 22 and 8, respectively. Corresponding to these case reports we have measured the virus prevalence in free living ticks in these four risk areas and compared these findings with the situation in high-risk areas in Latvia. In the years 1997-2000, 2,797 clinical TBE cases were recorded in Latvia. For the studies in Germany, a total of 17,398 Ixodesricinus ticks (14,860 nymphs and 2,538 adults) were collected by flagging and examined for TBEV, in Latvia the corresponding numbers were 525 I. ricinus ticks (350 adults and 175 nymphs) and 281 I. persulcatus ticks (adults only). Information concerning annual and seasonal differences of the TBEV prevalence in natural TBE foci is not available in Germany. This paper is a continuation of the study (Süss et al., 1999), starting in 1997. We investigated every year, in May and September, the virus prevalence in ticks in high risk areas of Bavaria (8 foci) and Baden-Wuerttemberg (5 foci). A total of 15,400 ticks (13,100 nymphs and 2,300 adults) were examined for TBEV. The ticks were tested for the presence of TBEV-RNA using a sensitive, nested-RT-PCR. The virus prevalence in the Bavarian foci of the whole tick population ranged from 0.3 to 2.0% during these four years, in adults between 1.2 and 5.3% and in nymphs between 0.1 and 1.4%. In the high-risk areas of Baden-Wuerttemberg, in the Black Forest, the estimated virus prevalence rates of investigated ticks varied from 0.2 to 3.4%, in adults from 0 to 4.8%, and in nymphs from 0.2 to 3.4%. Using the same methods, we have also tested the low risk areas in the Odenwald (840 nymphs, 160 adults) and in Rhineland-Palatinate (920 nymphs, 78 adults). Ticks were collected in those areas where most TBE cases were registered. The virus prevalence in the Odenwald was 0% in adults and 0.5% in nymphs, whereas in ticks from Rhineland-Palatinate we have not found any positive PCR signal. Sequence data of the PCR products have shown that all strains in Germany were closely related to the central European virus prototype Neudoerfl. In I. ricinus ticks, collected in Riga county, the following virus prevalence rates were found: in females 2.4%, in males 3.7%, and in all adults 3.0%, in nymphs 2.4% and in the I. ricinus tick population examined 2.8%. The virus prevalence in I. persulcatus, collected in the eastern parts of Latvia was 6% in females, 4% in males and 5% in all adults. All the PCR products were sequenced and a phylogenetic tree was constructed. Studies in natural foci of TBE in Latvia have shown that I. ricinus carried the central European virus subtype (prototype Neudoerfl) whereas in I. persulcatus two strains have been found, the central European virus subtype (prototype Neudoerfl) and the Siberian virus subtype (prototype Vasilchenko). Sequences of the Far Eastern subtype have not been detected yet." @default.
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- W2015336393 date "2002-06-01" @default.
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- W2015336393 title "Characterization of tick-borne encephalitis (TBE) foci in Germany and Latvia (1997–2000)" @default.
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- W2015336393 doi "https://doi.org/10.1016/s1438-4221(02)80007-8" @default.
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