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  • Online Resource  (3)
  • Korean Society for Parasitology  (3)
  • Kim-Jeon, Myung-Deok  (3)
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  • Online Resource  (3)
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  • Korean Society for Parasitology  (3)
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  • 1
    In: The Korean Journal of Parasitology, Korean Society for Parasitology, Vol. 58, No. 3 ( 2020-06-26), p. 301-308
    Abstract: Owing to global climate change, the global resurgence of vector-borne infectious diseases and their potential to inflict widespread casualties among human populations has emerged as a pivotal burden on public health systems. Tsutsugamushi disease (scrub typhus) in the Republic of Korea is steadily increasing and was designated as a legal communicable disease in 1994. The disease is a mite-borne acute febrile disease most commonly contracted from October to December. In this study, we tried to determine the prevalence of tsutsugamushi disease transmitted by chigger mites living on rodents and investigated their target vector diversity, abundance, and distribution to enable the mapping of hotspots for this disease in 2015. A total of 5 species belonging to 4 genera (109 mites): Leptotrombidium scutellare 60.6%, L. pallidum 28.4% Neotrombicula tamiyai 9.2%, Euschoengastia koreaensis/0.9%), and Neoschoengastia asakawa 0.9% were collected using chigger mite collecting traps mimicking human skin odor and sticky chigger traps from April to November 2015. Chigger mites causing tsutsugamushi disease in wild rodents were also collected in Hwaseong for the zoonotic surveillance of the vector. A total of 77 rodents belonging to 3 genera: Apodemus agrarius (93.5%), Crocidura lasiura (5.2%), and Micromys minutus (1.3%) were collected in April, October, and November 2015. The most common mite was L. pallidum (46.9%), followed by L. scutellare (18.6%), and L. orientale (18.0%). However, any of the chigger mite pools collected from rodent hosts was tested positive for Orientia tsutsugamushi, the pathogen of tsutsugamushi disease, in this survey.
    Type of Medium: Online Resource
    ISSN: 0023-4001 , 1738-0006
    Language: English
    Publisher: Korean Society for Parasitology
    Publication Date: 2020
    detail.hit.zdb_id: 2163174-8
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  • 2
    In: The Korean Journal of Parasitology, Korean Society for Parasitology, Vol. 57, No. 6 ( 2019-12-31), p. 691-698
    Abstract: The seasonal abundance of hard ticks that transmit severe fever with thrombocytopenia syndrome virus was monitored with a collection trap method every April to November during 2015-2018 and with a flagging method every July and August during 2015-2018 in Ganghwa-do (island) of Incheon Metropolitan City, Republic of Korea. This monitoring was performed in a copse, a short grass field, coniferous forest and broad-leaved forest. A total of 17,457 ticks (8,277 larvae, 4,137 nymphs, 3,389 females, and 1,654 males) of the ixodid ticks comprising 3 species ( 〈 i 〉 Haemaphysalis 〈 /i 〉 〈 i 〉 longicornis 〈 /i 〉 , 〈 i 〉 H 〈 /i 〉 . 〈 i 〉 flava 〈 /i 〉 , and 〈 i 〉 Ixodes 〈 /i 〉 〈 i 〉 nipponensis 〈 /i 〉 ) were collected with collection traps. Of the identified ticks, 〈 i 〉 H 〈 /i 〉 . 〈 i 〉 longicornis 〈 /i 〉 was the most frequently collected ticks (except larval ticks) (94.26%, 8,653/9,180 ticks (nymphs and adults)), followed by 〈 i 〉 H 〈 /i 〉 . 〈 i 〉 flava 〈 /i 〉 (5.71%, 524/9,180) and 〈 i 〉 Ix 〈 /i 〉 . 〈 i 〉 nipponensis 〈 /i 〉 (less than 0.04%, 3/9,180). The ticks collected with collecting traps were pooled and assayed for the presence of SFTS virus with negative results. In addition, for monitoring the prevalence of hard ticks, a total of 7,461 ticks (5,529 larvae, 1,272 nymphs, 469 females, and 191 males) of the ixodid ticks comprising 3 species ( 〈 i 〉 H 〈 /i 〉 . 〈 i 〉 longicornis 〈 /i 〉 , 〈 i 〉 H 〈 /i 〉 . 〈 i 〉 flava 〈 /i 〉 , and 〈 i 〉 Ix 〈 /i 〉 . 〈 i 〉 nipponensis 〈 /i 〉 ) were collected with flagging method. 〈 i 〉 H 〈 /i 〉 . 〈 i 〉 longicornis 〈 /i 〉 was the highest collected ticks (except larval ticks) (99.53%, 1,908/1,917 ticks (nymphs and adults)), followed by 〈 i 〉 H 〈 /i 〉 . 〈 i 〉 flava 〈 /i 〉 (1.15%, 22/1,917).
    Type of Medium: Online Resource
    ISSN: 0023-4001 , 1738-0006
    Language: English
    Publisher: Korean Society for Parasitology
    Publication Date: 2019
    detail.hit.zdb_id: 2163174-8
    Location Call Number Limitation Availability
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  • 3
    In: The Korean Journal of Parasitology, Korean Society for Parasitology, Vol. 58, No. 5 ( 2020-10-22), p. 551-558
    Abstract: The flaviviruses are small single-stranded RNA viruses that are typically transmitted by mosquitoes or tick vectors and are etiological agents of acute zoonotic infections. The viruses are found around the world and account for significant cases of human diseases. We investigated population of culicine mosquitoes in central region of Korean Peninsula, Incheon Metropolitan City and Hwaseong-si. Aedes vexans nipponii was the most frequently collected mosquitoes (56.5%), followed by Ochlerotatus dorsalis (23.6%), Anopheles spp. (10.9%), and Culex pipiens complex (5.9%). In rural regions of Hwaseong, Aedes vexans nipponii was the highest population (62.9%), followed by Ochlerotatus dorsalis (23.9%) and Anopheles spp. (12.0%). In another rural region of Incheon (habitat of migratory birds), Culex pipiens complex was the highest population (31.4%), followed by Ochlerotatus dorsalis (30.5%), and Aedes vexans vexans (27.5%). Culex pipiens complex was the predominant species in the urban region (84.7%). Culicine mosquitoes were identified at the species level, pooled up to 30 mosquitoes each, and tested for flaviviral RNA using the SYBR Green-based RT-PCR and confirmed by cDNA sequencing. Three of the assayed 2,683 pools (989 pools without Anopheles spp.) were positive for Culex flaviviruses, an insect-specific virus, from Culex pipiens pallens collected at the habitats for migratory birds in Incheon. The maximum likelihood estimation (the estimated number) for Culex pipiens pallens positive for Culex flavivirus was 25. Although viruses responsible for mosquito-borne diseases were not identified, we encourage intensified monitoring and long-term surveillance of both vector and viruses in the interest of global public health.
    Type of Medium: Online Resource
    ISSN: 0023-4001 , 1738-0006
    Language: English
    Publisher: Korean Society for Parasitology
    Publication Date: 2020
    detail.hit.zdb_id: 2163174-8
    Location Call Number Limitation Availability
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