Tick infestation risk and Borrelia burgdorferi s.l. infection-induced increase in host-finding efficacy of female Ixodes ricinus under natural conditions

Article

Abstract

An investigation of the risk of human tick infestation, together with the prevalence of Borrelia burgdorferi s.l. infection, was conducted in a sylvatic habitat in western Germany to provide data needed for future risk-benefit evaluations of acaricides used for clothing impregnation. Additionally, data were collected on behavioural changes in Borrelia burgdorferi s.l.-infected adult female I. ricinus ticks and the possible impact of such changes on host-finding efficacy. The risk of I. ricinus-infestation was determined by collecting from the protective clothing of volunteers and by dragging in known tick-infested sites in the Kühkopf Mountain area, Koblenz, Germany, from June through October 2006. The overall tick infestation rate per person per hour was 7.4 ± 5.5, with the following sex- and stage-specific differences: males 0.32 ± 0.37, females 1.1 ± 1.2, nymphs 3.6 ± 4.4, larvae 2.4 ± 3.5. Concurrent dragging revealed an average 19.4 ± 16.2 times higher infestation rate as well as a markedly lower infection rate with borreliae in adult I. ricinus ticks when compared to ticks collected from exposed human volunteers. Although the difference in infection rates was statistically significant (P < 0.023) only in adult female ticks, our data indicate that B. burgdorferi s.l. infection may increase host-finding efficacy in adult I. ricinus. The overall exposure risk was 1.0 B. burgdorferi s.l.-infected ticks per person per hour of exposure, or 0.25 ticks per 100 m walking distance in the study area.

Keywords

Ixodes ricinus Host-seeking activity Borrelia burgdorferi s.l. Human exposure risk 

Notes

Acknowledgements

We thank Marco Isack, Sabine Barz, Thorsten Lange, Bernd Bocklet and Dirk Hiller for their assistance with fieldwork. TibMolBiol, Berlin, kindly offered technical support, DNA from Borrelia burgdorferi s.s., and helpful guidance. We are also grateful to the Landesgesundheitsamt Baden-Württemberg, Stuttgart, Germany, for providing DNA samples from Borrelia afzelli and B. garinii.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Department of Medical Entomology/ZoologyCentral Institute of the Federal Armed Forces Medical ServiceKoblenzGermany
  2. 2.Defense Pest Management Information Analysis Center, Armed Forces Pest Management BoardWalter Reed Army Medical CenterWashingtonUSA

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