Effectiveness of a Fourth Dose of COVID-19 mRNA Vaccine Against Omicron Variant Among Elderly People in Singapore

Tan, CY; Chiew, CJ; Lee, VJ; Ong, B; Lye, DC; Tan, KB

Tan, CY (通讯作者),Minist Hlth, Communicable Dis Div, 12 Coll Rd, Singapore 169852, Singapore.

ANNALS OF INTERNAL MEDICINE, 2022; 175 (11): 1622