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Table 1 Prevalence (%) and loads of chigger infestations, seroprevalence (%) of Orientia tsutsugamushi (OT) exposure, and OT positivity rate (%) in chiggers among small mammal hosts in Taiwan during 2006–2010

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

Host species No. of captures (% of total) No. of counties Prevalence (%) of chiggers Mean # of chiggers/host (±SE)a Total chiggers (% of all) Seroprevalence (no. of assayed) OT positivity rate (no. of assayed)
Shrews        
Suncus murinus 272 (21.2) 8 16.2 12.8 ± 3.3 3,469 (2.7) NA 10.5 (19)
Rodents        
Apodemus agrarius 24 (1.9) 4 54.2 82.3 ± 18.2 1,975 (1.5) 57.9 (19) 0 (13)
Bandicota indica 83 (6.5) 6 45.8 51.7 ± 11.2 4,288 (3.3) 35.8 (81) 51.9 (27)
Callosciurus erythraeus 2 (0.2) 1 0 0 0 (0) 0 (1) NA
Mus caroli 144 (11.2) 8 19.4 1.9 ± 0.5 271 (0.2) 16.1 (124) NA
Mus musculus 47 (3.7) 6 14.9 2.3 ± 1.1 109 (0.1) 56.5 (46) NA
Niviventer coninga 2 (0.2) 2 0 0 0 (0) 100 (1) NA
Rattus exulans 26 (2.0) 1 34.6 14.8 ± 4.6 385 (0.3) 15.4 (26) 66.7 (9)
Rattus losea 626 (48.7) 9 61.3 156.9 ± 11.2 98,239 (76.4) 46.2 (520) 54.8 (230)
Rattus norvegicus 11 (0.9) 6 9.1 79.3 ± 79.3 872 (0.7) 20.0 (10) 0 (1)
Rattus tanezumi 48 (3.7) 1 100 394.0 ± 28.5 18,912 (14.7) 91.7 (48) 95.8 (48)
Overall 1,285 9 44.5 100.0 ± 6.2 128,520 43.0 (876) 55.9 (347)
  1. aMean # chiggers/host is calculated across all captures, not just those animals that harboured chiggers