AU - Lau D FAU - Lau, Davy AU - Chan A FAU - Chan, Alex TI - COVID-19 infection risk increases as the time elapsed since receiving a 2nd dose of Pfizer vaccine increases PT - BOOK SECTION DP - 2015 BTI - 2 Minute Medicine DA - 2015 Y2 - 2024/04/19 UR - accessmedicina.mhmedical.com/updatesContent.aspx?gbosid=579211