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KMID : 1143420220150221526
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Public Health Weekly Report
2022 Volume.15 No. 22 p.1526 ~ p.1531
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Presumptive COVID-19 reinfection cases
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Yun-Go-Woon
Jang Eun-Jung
Yi Seon-Ju
Wang Seong-Jin
Park Young-Joon
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Abstract
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As the number of confirmed cases of coronavirus disease 2019 (COVID-19) surged after the emergence of the Omicron
variant in December 2021, the possibility of reinfection surfaced. Therefore, 16,130,920 cumulative confirmed cases from
January 2020 to April, 2022, were investigated for presumptive COVID-19 reinfection. The results revealed that there were
55,906 presumptive reinfection cases, with a reinfection incidence rate of 0.35%. The number of COVID-19 reinfection cases increased by approximately three times from January to April 2022, which is the period after the Omicron variant outbreak, compared with that noted before the Omicron variant outbreak. The occurrence of presumptive COVID-19 reinfection cases shows an increasing trend because the number of confirmed cases surged after to the Omicron variant outbreak and individuals with a positive rapid antigen test result were also recognized as confirmed cases.
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KEYWORD
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COVID-19, Redetection, Reinfection, Omicron variant
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