Serosurveillance of Scrub Typhus in Small Mammals Collected from Military Training Sites near the DMZ, Northern Gyeonggi-do, Korea, and Analysis of the Relative Abundance of Chiggers from Mammals Examined
NAVAL MEDICAL RESEARCH CENTER SILVER SPRING MD RICKETTSIAL DISEASES DEPT
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Comprehensive quarterly serosurveillance on scrub typhus in small mammals collected from military training sites located near the Demilitarized Zone DMZ, northern Gyeonggi-do Province, ROK was conducted to determine the potential rodent-borne and associated ectoparasite disease risks to military personnel. A total of 1,196 rodents and insectivores representing 8 species, Apodemus agrarius 87.3, n 1,044, Mus musculus 5.4, n 65, Crocidura asiura 3.3, n 40, Microtus fortis 2.6, n 31, Micromys minutus 0.3, n 4, Tscherskia triton 0.3, n 4, Rattus norvegicus 0.3, n 4, and Myodes regulus 0.3, n 4 were assayed for the presence of antibodies to Orientia tsutsugamushi. 0. tsutsugamushi antibodies were detected in 6 of 8 species and seroprevalence determined A. agrarius 45.6, M. musculus 23.1, M. fortis 48.4, M. minutus 50.0, T. triton 50.0, and R. norvegicus 25.0. A total of 31,184 chigger mites collected from 508 rodents and insectivores were slide-mounted and 10 species belonging to 4 genera were identified. Leptotrombidium pallidum 53.4 was the most frequently collected, followed by L. palpale 15.7, Neotrombicua tamiyai 14.3, L. orientale 10.7, L. zetum 3.1, Walchia tragiis 2.1, and L. gemiticu um 0.8, while the remaining 3 species, L. subintermedium, N. gardelai, and Euschoengastia koreaensis were rarely observed prevalence 1 0. In contrast to previous surveys, higher chigger indices of the primary scrub typhus vectors L. pallidum 165.4, L. orientale 45.0, and L. palpale 21.4, were observed during the spring season.
- Government and Political Science
- Medicine and Medical Research
- Military Forces and Organizations