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Volume 28, Number 3—March 2022
Research Letter

SARS-CoV-2 Breakthrough Infections after introduction of 4 COVID-19 Vaccines, South Korea, 2021

Seonju Yi1, Young June Choe1, Jia Kim, Yoo-Yeon Kim, Ryu Kyung Kim, Eun Jung Jang, Do Sang Lim, Hye Ryeon Byeon, Sangwon Lee, Eonjoo Park, Seung-Jin Kim, and Young-Joon ParkComments to Author 
Author affiliations: Korea Disease Control and Prevention Agency, Cheongju, South Korea (S. Yi, J. Kim, Y.-Y. Kim, R.K. Kim, E.J. Jang, D.S .Lim, H.R. Byeon, S. Lee, E. Park, S.-J. Kim, Y.-J. Park); Korea University Anam Hospital, Seoul, South Korea (Y.J. Choe)

Main Article


Severe acute respiratory syndrome coronavirus 2 breakthrough infections by vaccine type, South Korea, 2021

Variable ChAdOx1 nCov-19, AstraZeneca,
BNT162b2, Pfizer-BioNTech, prime/booster Ad26.COV2.S, Johnson & Johnson/Janssen, single dose mRNA-1273, Moderna, prime/booster ChAdOx1 nCov-19/BNT162b2, AstraZeneca/Pfizer-BioNTech, prime/booster
Observed period Apr 7–Oct 10 Apr 3–Oct 10 Jun 24–Oct 1 Jul 30–Oct 10 Jul 19–Oct 10
Total vaccinations, no. 8,737,343 10,235,891 1,408,921 1,190,973 1,600,998
Breakthrough infections* 21.7 8.5 42.6 1.8 21.3
Serious outcomes* 0.3 0.2 0.9 0.0 0.1
Deaths* 0.2 0.0 0.0 0.0 0.1
Secondary transmission* 4.9 2.1 19.2 0.4 2.0

*Monthly age-adjusted rate per 100,000 population.

Main Article

1These authors contributed equally to this article.

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