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Table 4 Prevalence (%) and loads of chigger infestations, seroprevalence (%) of Orientia tsutsugamushi (OT) exposure, and OT positivity rate (%) in chiggers on Rattus losea at different sites in Taiwan during 2006–2010

From: Surveillance of potential hosts and vectors of scrub typhus in Taiwan

Study site No. of R. losea captures Prevalence (%) of chiggers Mean # of chiggers/host (±SE)a Seroprevalence (no. of assayed) OT positivity rate (no. of assayed) Incidence rate of scrub typhusb
Eastern Taiwan       
Yilan 91 67.0 72.9 ± 8.5 55.6 (72) 71.2 (52) 0
Hualien 41 95.1 359.0 ± 44.1 80.5 (41) 71.8 (39) 0.65
Taitung 20 95.0 158.7 ± 30.2 63.2 (19) 40.0 (15) 2.18
Western Taiwan       
Taoyuan 116 0 0 0.9 (116) NA 0.05
Taichung 33 6.1 2.7 ± 2.3 3.2 (31) 50.0 (2) 0
Kaoping 44 0 0 0 (44) NA 0
Offshore islands       
Matsu 57 94.7 324.5 ± 34.4 60.0 (55) 9.5 (42) 6.44
Kinmen 168 91.1 145.4 ± 15.2 77.9 (86) 65.8 (38) 7.31
Penghu 56 100 548.4 ± 75.2 94.6 (56) 59.5 (42) 12.13
  1. aMean # chiggers/host is calculated across all captures, not just those animals that harboured chiggers
  2. bNumber of human cases per 100000 residents per month