“…MCV-COV1901 has emergency authorization use in Taiwan as of July 2021, 19 and has since advanced to larger clinical trials, including a trial initiated by WHO. 50 Additional information accumulates from these trials, but further studies are needed to see if PWH require distinct immunization strategies with improved immunogenicity, such as boosters or additional doses, 51,52 heterologous revaccination, 53 or higher doses as with hepatitis B 54 and that for in uenza vaccine 55 . Chen, Ching-Tai Huang, Hsiao-Ting Chang, Shinn-Jang Hwang, Ning-Chi Wang, Ming-Che Liu , Yu-Lin Lee, , Tzou-Yien Lin, and Wen-Sen Lee had nothing to declare.…”