Seasonal distribution of Haemaphysalis longicornis (Acari: Ixodidae) and detection of SFTS virus in Gyeongbuk Province, Republic of Korea, 2018

Lee, JaeSeok; Moon, Kyung-Hwan; Kim, Myeonghwan; Lee, Wook-Gyo; Lee, Hee-II; Park, Jong Kyun; Kim, Young Ho

doi:10.1016/j.actatropica.2021.106012

Cited by 15 publications

(19 citation statements)

References 63 publications

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“…The present study showed that H. longicornis (70.0%) is the most common species detected in cases of human tick bites, followed by A. testudinarium (17.8%), I. nipponensis (6.1%), H. flava (4.4%), and I. persulcatus (1.7%). These findings are consistent with the results of a previous study in the ROK, which identified H. longicornis as the dominant questing tick species collected from various habitats [40,41]. In addition, previous studies have shown that A. testudinarium has a relatively low population density collected by dragging, flagging, and dry ice-baited trapping [7,42].…”

Section: Discussionsupporting

confidence: 92%

“…H. longicornis is most dominant tick species and is considered an important vector for tick-borne diseases in the ROK [5,40]. The present study showed that H. longicornis (70.0%) is the most common species detected in cases of human tick bites, followed by A. testudinarium (17.8%), I. nipponensis (6.1%), H. flava (4.4%), and I. persulcatus (1.7%).…”

Section: Discussionmentioning

confidence: 52%

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Molecular Detection of Anaplasma phagocytophilum and Ehrlichia Species in Ticks Removed from Humans in the Republic of Korea

et al. 2022

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Human granulocytic anaplasmosis (HGA) and human monocytic ehrlichiosis (HME) are zoonotic tick-borne diseases transmitted via tick bites. To determine the state of human Anaplasma and Ehrlichia infections caused by tick bites in the Republic of Korea (ROK), we conducted a nationwide investigation of human cases of tick bites in 2020. A total of 180 ticks were obtained, comprising Haemaphysalis longicornis (70.0%), Amblyomma testudinarium (17.8%), Ixodes nipponensis (6.1%), H. flava (4.4%), and I. persulcatus (1.7%). In three cases (1.7%; 95% CI: 0.3–4.9), A. phagocytophilum was detected in Ixodes ticks using primers for Anaplasma-specific genes (16s rRNA, ankA, and msp4). Conversely, Ehrlichia sp. was only detected in H. longicornis, in two cases (1.1%; 95% CI: 0.1–4.0). To the best of our knowledge, this is the first record of Ehrlichia sp. in ticks parasitizing humans in the ROK. As concerns remain about the possibility of HGA and HME transmission, continuous monitoring and management of the pathogens and vectors are necessary.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 52%

Molecular Detection of Anaplasma phagocytophilum and Ehrlichia Species in Ticks Removed from Humans in the Republic of Korea

et al. 2022

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“…Although we only had data of one year (2017) on larval MFIR, the observed value of 2.5% was markedly higher than 0.3%, as reported in a previous study [16]. Recently, it has been reported that SFTSV was detected at all developmental stages including adults, nymphs, larvae, and eggs of H. longicornis ticks in Korea and China [16,29,30]. Moreover, the presence of SFTSV was also confirmed in several organs of H. longicornis larvae, nymphs, and adults [15].…”

mentioning

confidence: 50%

“…Epidemiological studies about the prevalence of SFTSV in ticks have generally been conducted based on pooling method for reasons of convenience, economic benefit, and high sam- ple size of ticks. In Korea, studies on SFTSV prevalence in pooled ticks from vegetation have reported an MFIR of 0-0.6% (0.5% in 8 provinces, 0.6% in Gyeongbuk province, and 0% in Ganghwa-do and Gyeonggi provinces) [17,18,28,29]. On the other hand, when analyses were made without using the pooling method, higher SFTSV prevalence in ticks was observed, with an IR of 3.6% [16].…”

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confidence: 99%

Severe Fever with Thrombocytopenia Syndrome Virus in Ticks in the Republic of Korea

Kang

Cho

et al. 2022

Korean J Parasitol

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Severe fever with thrombocytopenia syndrome virus (SFTSV) is a zoonotic, tick-borne RNA virus of the genus Bandavirus (Family Phenuiviridae), mainly reported in China, Japan, and the Republic of Korea (Korea). For the purpose of this study, a total of 3,898 adult and nymphal ticks of species Haemaphysalis longicornis (94.2%), Haemaphysalis flava (5.0%), Ixodes nipponensis (0.8%), and 1 specimen of Ixodes ovatus, were collected from the Deogyusan National Park, Korea, between April 2016 and June 2018. A single-step reverse transcriptase–nested PCR was performed, targeting the S segment of the SFTSV RNA. Total infection rate (IR) of SFTSV in individual ticks was found to be 6.0%. Based on developmental stages, IR was 5.3% in adults and 6.0% in nymphs. The S segment sequences obtained from PCR were divided into 17 haplotypes. All haplotypes were phylogenetically clustered into clades B-2 and B-3, with 92.7% sequences in B-2 and 7.3% in B-3. These observations indicate that the Korean SFTSV strains were closer to the Japanese than the Chinese strains. Further epidemiological studies are necessary to better understand the characteristics of the Korean SFTSV and its transmission cycle in the ecosystem.

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“…This is related to the developmental stage of the ticks and seasonal factors, which is consistent with that of previous results [17] of tick collection from March to July. In a previous study investigating the number of ticks by developmental stage, the peak populations of nymphs, adults, and larvae were observed in April-June, June-July, and August-September, respectively [17,18]. With respect to the distribution of ticks, H. longicornis was found abundantly in all three regions (CC: 1374 ticks; GS: 2110 ticks; JL: 765 ticks).…”

Section: Discussionmentioning

confidence: 81%

Molecular Identification of Borrelia spp. from Ticks in Pastures Nearby Livestock Farms in Korea

Lee

Shin

et al. 2021

Insects

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Ticks are vectors that spread pathogenic bacteria, viruses, and protozoa. As the number of ticks increases due to climate change, the importance of the study of tick-borne pathogens has also increased. This study was conducted to investigate the distribution of the major tick species causing Lyme borreliosis and regional differences in the prevalence of Borrelia spp. by tick species. Borrelia infection was confirmed not only in Ixodes ticks, which are the major vectors of Borrelia spp., but also in Haemaphysalis and Amblyomma ticks. PCR targeting the 5S-23S rRNA intergenic spacer region (rrf-rrl) was performed to confirm Borrelia positivity. A total of 6102 ticks (736 pools) were tested, and the proportion was Haemaphysalis longicornis nymphs and adults at 69.2%, Haemaphysalis flava nymphs and adults at 13.9%, Haemaphysalis spp. larva at 14.3%, Ixodes nipponensis at 0.8%, and Amblyomma testudinarium at 1.9%. Ixodes nipponensis showed the highest minimum infection rate (MIR: 34.00; 17 pools/50 ticks) for Borrelia spp., followed by A. testudinarium (MIR: 0.88), and H. longicornis (MIR: 0.05). In particular, to our knowledge Borrelia infection was first confirmed in A. testudinarium in Korea. As a result of phylogenetic analysis, all sequences were grouped with Borreliaafzelii isolates and showed a close relationship with high identity. Considering that B. afzelii causes infectious zoonotic diseases, continuous monitoring and attention are needed, although it has a low prevalence in this study.

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Seasonal distribution of Haemaphysalis longicornis (Acari: Ixodidae) and detection of SFTS virus in Gyeongbuk Province, Republic of Korea, 2018

Cited by 15 publications

References 63 publications

Molecular Detection of Anaplasma phagocytophilum and Ehrlichia Species in Ticks Removed from Humans in the Republic of Korea

Molecular Detection of Anaplasma phagocytophilum and Ehrlichia Species in Ticks Removed from Humans in the Republic of Korea

Severe Fever with Thrombocytopenia Syndrome Virus in Ticks in the Republic of Korea

Molecular Identification of Borrelia spp. from Ticks in Pastures Nearby Livestock Farms in Korea

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