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KMID : 1143420230160170521
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Public Health Weekly Report
2023 Volume.16 No. 17 p.521 ~ p.537
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Malaria Vector Mosquitoes Surveillance and Plasmodium Vivax Infections in the Republic of Korea, 2022
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Han Bo-Gyeong
Shin Hyun-Il
Ju Jung-Won
Lee Hee-Il
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Abstract
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The Division of Vectors and Parasitic Diseases of the Korea Disease Control and Prevention Agency has been conducting malaria vector mosquitoes (Anopheles spp.) since 2009 for eradicating malaria in the Republic of Korea. The density of mosquito vectors and Plasmodium vivax in mosquitoes detection were investigated from April to October 2022 at 50 locations in high-risk malaria areas ( Incheon, Gyeonggi, and parts of Gangwon). In 2022, the trap index ( TI; mosquitoes/trap/night) of mosquito vectors was 68, which was lower by 34.6% and 27.7% compared to the average year (2017?2021) and 2021, respectively. The highest density of mosquito vectors over the year 2022 was a TI of 8 in the 33rd week, which was five weeks later than that of the year 2021, where the highest density was observed in the 28th week (TI=10). The peak density of malaria vector mosquitoes occurred in the 27th week (end of June) of 2022 in Gyeonggi, the 33rd week (August) in Gangwon, and the 37th week (early September) in Incheon. The highest density of mosquito vectors was observed in Paju (TI=195) followed by Cheorwon (TI=119), and Yang-gu (TI=88). In addition, one pool of P. vivax (with a minimum infection rate of 0.07) was detected in the 37th week of 2022, which was five weeks later than that of 2021. The steady occurrence of malaria vectors and the appearance of positively infected mosquitoes demands caution against malaria infection and continuous mosquito surveillance. Subsequently, these data are important for implementing effective malaria prevention strategies, such as early warning and alert systems.
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KEYWORD
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Malaria vector mosquito, Plasmodium vivax, Monitoring, High-risk region
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