Korean J Parasitol.  2021 Oct;59(5):473-479. 10.3347/kjp.2021.59.5.473.

Geographical Distribution and Epidemiologic Factors of Chigger Mites on Apodemus agrarius during Autumn in Korea

Affiliations
  • 1Department of Environmental Medical Biology and Institute of Tropical Medicine, Yonsei University College of Medicine, Seoul 03722, Korea
  • 2Biological Resources Research Department, National Institute of Biological Resources, Inchoen 22689, Korea
  • 3Department of Biomedical Laboratory Science, Shinhan University, Uijeongbu 11644, Korea
  • 45th Medical Detachment, 168th Multifunctional Medical Battalion, 65th Medical Brigade, Unit 15247, APO 96205-5247, USA
  • 5Department of Environmental Medical Biology, Wonju Yonsei University College of Medicine, Wonju 26426, Korea
  • 6KU Open Innovation Center, Department of Environmental and Tropical Medicine, School of Medicine, Konkuk University, Chungju 27478, Korea

Abstract

A nationwide survey of chigger mites causing scrub typhus and an investigation of epidemiologic factors for chigger mites was conducted at 16 localities in 8 provinces in Korea during autumn 2009, 2012, and 2013. A total of 233 Apodemus agrarius were captured, and all were infested with chigger mites. The chigger index was highest in Chungcheongbuk-do in 2009 (358.3) and 2012 (290.1) and Chungcheongnam-do in 2013 (294.4). The predominant chigger mite species was Leptotrombidium pallidum in the northern and central parts and L. scutellare in the southern and western parts, Korea. L. pallidum was not found in Jellanam-do and Gyeongsangnam-do and the distribution of L. scutellare had been expanded in the northern parts of Korea. The chigger index of L. pallidum was positively correlated with temperature and negatively correlated with humidity. The incidence of scrub typhus is dependent on L. scutellare index. These findings could be helpful to monitor the distribution of chigger mites and to develop a preventive measures for scrub typhus in Korea.

Keyword

scrub typhus; weather; epidemiology; Korea
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