PHWR Public Health Weekly Report

Vol.14 No.43, October 21, 2021 Article TypeEpidemiology and Surveillance

• Epidemiology and Surveillance 2021-10-21

  0 374 89

  Evaluation of the acaricidal efficacy of Haemaphyslis longicornis, a vector of Severe Fever with Thrombocytopenia Syndrome (SFTS)

  Kim Gi-Hun, Kim Hyunwoo, Lee Hee-Il

  Public Health Weekly Report 2021; 14(43): 3040-3049

  

  

  Abstract

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  In Republic of Korea, Severe Fever with Thrombocytopenia Syndrome (SFTS) carries a great deal of medical importance for public health, with a total of 1,162 cases occurring in the past five years (2016-2020). SFTS is a tick-borne disease transmitted by Haemaphysalis longicornis. In Republic of Korea, chemical control with acaricides is carried out to suppress the occurrence of SFTS patients. However, the efficacy of chemicals on ticks by geographical region has not been confirmed. Therefore, to confirm the effect of acaricidal agents, this study selected eight regions with the most SFTS patients and compared the acaricidal effects of three classes of seven chemicals: organophosphate, neonicotinoid, and pyrethroid
  In all eight regions, high acaricidal efficacy was confirmed with deltamethrin and low acaricidal efficacy was confirmed with imidacloprid. As a result of comparing the acaricidal effects of deltamethrin and imidacloprid, a difference of 80.6 to 3284.4 times was confirmed. The acaricidal effect by class was higher in the pyrethroid than in organophosphate and neonicotinoid. In addition, the acaricidal efficacy of each growth stage was compared. In the case of larvae, there was a difference in acaricidal efficacy of 22.3 to 1518.5 times compared to that of nymphs and adults.
  Based on the results of this investigation, the pyrethroid class was more effective in controlling ticks and it was determined that efficacy can be increased by performing control measures according to the life cycle of ticks.

• Epidemiology and Surveillance 2021-10-21

  0 167 161

  Rift Valley Hemorrhagic Fever: characteristics and diagnosis

  Kim Yu-Ri, Yi Hwajung, Choi Myung-Min, Rhie Gi-Eun

  Public Health Weekly Report 2021; 14(43): 3050-3057

  

  

  Abstract

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  Rift Valley Fever (RVF) is a mosquito-borne viral illness caused by Rift Valley Fever Virus (RVFV). RVF is a zoonosis that can potentially increase the prevalence of abortion or fetal malformation in ruminants. In human, the infection of RVFV can result in clinical symptoms such as encephalitis or hemorrhagic fever in severe cases. RVFV is endemic through most of the African continent. However it has also emerged in the Middle East, northern Egypt and the Comoros islands. This implies that the geographical range of RVFV is likely expanding out of Africa. Furthermore, outbreaks of RVF can have a serious impact on a country's livestock industry and on public health. Although RVF has not been reported in South Korea, the possibility of RVF’s emergence is not able to be excluded due to frequent international travels and movement between countries. Therefore, the laboratory diagnostics in suspected persons play an important role for the rapid treatment of the patients and play an important role in the response to the emergence of RVF.