biostudies-literatureUnknown13(5)Jang EJ<h4>Objectives</h4>We estimated the overall and age-specific percentages of the Korean population with presumed immunity against severe acute respiratory syndrome coronavirus 2 (SARSCoV-2) as of April 2022 using the national registry.<h4>Methods</h4>We used the national coronavirus disease 2019 (COVID-19) infection and vaccination registry from South Korea, as described to define individuals with a previous history of COVID-19 infection, vaccination, or both, as persons with presumed immunity.<h4>Results</h4>Of a total of 53,304,627 observed persons, 24.4% had vaccination and infection, 58.1% had vaccination and no infection, 7.6% had infection and no vaccination, and 9.9% had no immunity. The SARS-CoV-2 Omicron variant emerged at a time when the presumed population immunity ranged from 80Osong public health and research perspectives377-381https://www.ebi.ac.uk/biostudies/studies/S-EPMC9633270biostudies-literaturePresumed population immunity to SARS-CoV-2 in South Korea, April 2022.PMC9633270Lee SChoe YJKim YYJang EJLim DSChoe SAPark YJYi SKim JKim RKLee JHfalsePresumed population immunity to SARS-CoV-2 in South Korea, April 2022.<h4>Objectives</h4>We estimated the overall and age-specific percentages of the Korean population with presumed immunity against severe acute respiratory syndrome coronavirus 2 (SARSCoV-2) as of April 2022 using the national registry.<h4>Methods</h4>We used the national coronavirus disease 2019 (COVID-19) infection and vaccination registry from South Korea, as described to define individuals with a previous history of COVID-19 infection, vaccination, or both, as persons with presumed immunity.<h4>Results</h4>Of a total of 53,304,627 observed persons, 24.4% had vaccination and infection, 58.1% had vaccination and no infection, 7.6% had infection and no vaccination, and 9.9% had no immunity. The SARS-CoV-2 Omicron variant emerged at a time when the presumed population immunity ranged from 802022-01-01T00:00:00Z2022 Oct2025-04-25T23:23:22.644Z2025-04-06T09:23:24.196ZS-EPMC96332703632824210.24171/j.phrp.2022.0209