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  • Title: Molecular detection of Rickettsia raoultii, Rickettsia tamurae, and associated pathogens from ticks parasitizing water deer (Hydropotes inermis argyropus) in South Korea.
    Author: Seo MG, Kwon OD, Kwak D.
    Journal: Ticks Tick Borne Dis; 2021 Jul; 12(4):101712. PubMed ID: 33819743.
    Abstract:
    Most defined Rickettsiales, which can be transmitted by ticks, are known to be important zoonotic pathogens. Some of these pathogens can cause severe diseases in humans, including anaplasmosis, rickettsioses, and ehrlichiosis. Previous studies in South Korea have investigated tick-borne pathogens (TBPs) residing in ticks found on grassy vegetation and animals. However, there is limited phylogenetic information on TBPs in ticks parasitizing Korean water deer (KWD; Hydropotes inermis argyropus). This study evaluated the prevalence, risk factors (regions, tick stages, and tick species), and coinfections of TBPs in ticks parasitizing KWD. Were collected a total of 283 hard ticks, including Haemaphysalis longicornis, Haemaphysalis flava, and Ixodes nipponensis from KWD in South Korea from 2013 to 2017. In 173 tested tick pools, genes for seven TBPs, namely Rickettsia raoultii (20 %), Rickettsia tamurae (1 %), Candidatus Rickettsia longicornii (31 %), Ehrlichia canis (3 %), Anaplasma capra (3 %), Anaplasma bovis (2 %), and Anaplasma sp. (1 %), were detected. The unidentified Anaplasma sp. isolates revealed a 98.4 %-99.3 % sequence identity with Anaplasma sp. in GenBank sequences obtained from ticks. To the best of our knowledge, this is the first study to report the presence of the emerging human pathogen R. tamurae in South Korea. These results should increase awareness about the need for continued development of epidemiological control measures, and medical and veterinary communities must be informed of their high infection potential and clinical complexity in humans.
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