Estimating contact-adjusted immunity levels against measles in South Korea and prospects for maintaining elimination status.
Chun, June Young;
Park, Wan Beom;
Kim, Nam Joong;
Choi, Eun Hwa;
Funk, Sebastian;
Oh, Myoung-Don;
(2019)
Estimating contact-adjusted immunity levels against measles in South Korea and prospects for maintaining elimination status.
Vaccine, 38 (2).
pp. 107-111.
ISSN 0264-410X
DOI: https://doi.org/10.1016/j.vaccine.2019.10.040
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Measles has been reemerging in South Korea since December 2018 resulting in 185 cases by September 2019. We calculated contact-adjusted immunity levels against measles in South Korea using national seroprevalence data in 2014, vaccination uptake rates, and an age-specific contact matrix. We further explored options to achieve a contact-adjusted immunity level of 93% for herd immunity. The assessed contact-adjusted immunity level has increased from 86% in 2014 to 92% in 2018. Herd immunity could be achieved with immunizing 50% of susceptibles among birth cohorts 1999-2003 in 2018. Contact-adjusted immunity levels against measles have increased recently in South Korea, although they might not yet be high enough to guarantee herd immunity.
