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KMID : 1143420190120371423
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Public Health Weekly Report
2019 Volume.12 No. 37 p.1423 ~ p.1434
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Survey of ticks based on epidemiological investigation of severe fever with thrombocytopenia syndrome patients in South Korea, 2018
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Kim Seong-Yoon
Lee Eun-Jung
Song Bong-Goo
Lim Hyung-Woo
Roh Jong-Yul
Cho Shin-Hyeong
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Abstract
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The tick survey based on the epidemiological investigation of severe fever with thrombocytopenia syndrome (SFTS) patients was performed to find encounter/contact environments between patients and ticks. The predictable environments
were categorized 3 groups as flatland, mountain-side hill and mountain according to their characteristics of landform. The
category of survey area was divided by 13 sub-categories according to their status and usage. In 2018, we surveyed ticks
and their SFTS virus at 74 environments of 20 SFTS case regions including Jeju islands. Mountain-side hill (n=47) was pointed out most visiting place by patients. We compared the tick density (flag index) at each environment and investigated SFTS virus in ticks. A total of 8,344 ticks were collected by flaggings and dry ice traps. Haemaphysalis longicornis was
predominant species as 95.9% and nymphal stage ticks were collected by 73.9%. Tick density (flag index) at mountain-side hill (5.9) was higher than those at flatland (1.7) and mountain (0.9). In the view of plant traits, tick density was higher at ankle high-plants and at bracken inhabitation. The existence of sheds and grazing livestock increased tick density but weeding and chemical controlling decreased. In conclusion, the results suggested that a typical environment at which SFTS patients encounter ticks might be an ankle height grassland of mountain-side hill. Tick controls including weeding on restricted area might be effective to decrease tick population and designate ‘tick safety zone’.
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KEYWORD
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Severe fever with thrombocytopenia syndrome, Patient, Tick, Investigation
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