Effectiveness of Heterologous COVID-19 Vaccine Booster in Korean Elderly Population, 2022.
Seon Kyeong ParkYoung June ChoeEun Jung JangRyu Kyung KimSang-Won LeeGeun-Yong KwonJeeyeon ShinSang-Yoon ChoiMi Jin JeongYoung Joon ParkPublished in: Journal of Korean medical science (2023)
We conducted a cohort study to assess vaccine effectiveness (VE) of coronavirus disease 2019 vaccine combinations on severe acute respiratory syndrome coronavirus 2 critical infection and death among elderly population in Korea. From January to August 2022, VE against death for 4 doses mRNA recipients was 96.1%, whereas 1-dose viral vector + 3-dose mRNA recipients had VE of 90.8%.