Parasites, Hosts and Diseases

"Won-Jong Jang"

Original Article

Distribution of Rickettsia spp. in Ticks from Northwestern and Southwestern Provinces, Republic of Korea: Ju Jiang, Yeon-Joo Choi, Jeoungyeon Kim, Heung-Chul Kim, Terry A Klein, Sung-Tae Chong, Allen L. Richards, Hye-Jin Park, Sun-Hye Shin, Dayoung Song, Kyung-Hee Park, Won-Jong Jang; Korean J Parasitol 2019;57(2):161-166.
Published online April 30, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.2.161

Abstract
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This study was done to characterize distribution of Rickettsia spp. in ticks in the northwestern and southwestern provinces in the Republic of Korea. A total of 2,814 ticks were collected between May and September 2009. After pooling, 284 tick DNA samples were screened for a gene of Rickettsia-specific 17-kDa protein using nested PCR (nPCR), and produced 88 nPCR positive samples. Of these positives, 75% contained 190-kDa outer membrane protein gene (ompA), 50% 120-kDa outer membrane protein gene (ompB), and 64.7% gene D (sca4). The nPCR products of ompA, ompB, and sca4 genes revealed close relatedness to Rickettsia japonica, R. heilongjiangensis, and R. monacensis. Most Rickettsia species were detected in Haemaphysalis longicornis. This tick was found a dominant vector of rickettsiae in the study regions in the Republic of Korea.

Citations

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Brief Communication

Larval Chigger Mites Collected from Small Mammals in 3 Provinces, Korea: In-Yong Lee, Hyeon-Je Song, Yeon-Joo Choi, Sun-Hye Shin, Min-Kyung Choi, So-Hyun Kwon, E-Hyun Shin, Chan Park, Heung-Chul Kim, Terry A. Klein, Kyung-Hee Park, Won-Jong Jang; Korean J Parasitol 2014;52(2):225-229.
Published online April 18, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.2.225

Abstract
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A total of 9,281 larval chigger mites were collected from small mammals captured at Hwaseong-gun, Gyeonggi-do (Province) (2,754 mites from 30 small mammals), Asan city, Chungcheongnam-do (3,358 mites from 48 mammals), and Jangseong-gun, Jeollanam-do (3,169 for 62 mammals) from April-November 2009 in the Republic of Korea (= Korea) and were identified to species. Leptotrombidium pallidum was the predominant species in Hwaseong (95.8%) and Asan (61.2%), while Leptotrombidium scutellare was the predominant species collected from Jangseong (80.1%). Overall, larval chigger mite indices decreased from April (27.3) to June (4.9), then increased in September (95.2) and to a high level in November (169.3). These data suggest that L. pallidum and L. scutellare are the primary vectors of scrub typhus throughout their range in Korea. While other species of larval chigger mites were also collected with some implications in the transmission of Orientia tsutsugamushi, they only accounted for 11.2% of all larval chigger mites collected from small mammals.

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