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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