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Table 1 Prevalence of R. helvetica in ticks.

From: Ixodes ricinus ticks are reservoir hosts for Rickettsia helvetica and potentially carry flea-borne Rickettsia species

Location

Area type

Collection (Years)

Ticks (n) all 3 stages

R. helvetica

Ameland (AL)

Vegetation rich dune

Tick bites (2004-06)

169

12%

Bijlmerweide (BW)

City park

Flagging (2000-02)

39

36%

Duin en kruidberg (DK)

Vegetation-rich dune

Flagging (2000-08)

1295

66%

Heumesoord (HO)

Heather/forest

Flagging (2007)

89

21%

Houtvesterijen (HV)

Forest

Flagging (2000-02)

143

6%

  1. Ticks from different geographical locations in The Netherlands were tested for the presence of R. helvetica. Ticks (larvae, nymphs and adults) were collected from different area types, in different years, and the infection rate with R. helvetica is expressed as a percentage. As the infection rates between the different tick stages were not significantly different within each location, the overall infection rate is presented.