Waning of specific antibodies against Delta and Omicron variants five months after a third dose of BNT162b2 SARS-CoV-2 vaccine in elderly individuals oleh Yun Shan Goh, Angeline Rouers, Siew-Wai Fong, Nicole Ziyi Zhuo, Pei Xiang Hor, Chiew Yee Loh, Yuling Huang, Vanessa Kexin Neo, Isaac Kai Jie Kam, Bei Wang, Eve Zi Xian Ngoh, Siti Nazihah Mohd Salleh, Raphael Tze Chuen Lee, Raphael Tze Chuen Lee, Surinder Pada, Louisa Jin Sun, Desmond Luan Seng Ong, Jyoti Somani, Eng Sing Lee, Eng Sing Lee, NCID Study Group, COVID-19 Study Group, Sebastian Maurer-Stroh, Sebastian Maurer-Stroh, Sebastian Maurer-Stroh, Sebastian Maurer-Stroh, Sebastian Maurer-Stroh, Cheng-I Wang, Yee‐Sin Leo, Yee‐Sin Leo, Yee‐Sin Leo, Yee‐Sin Leo, Yee‐Sin Leo, Ee Chee Ren, Ee Chee Ren, David C. Lye, David C. Lye, David C. Lye, David C. Lye, Barnaby Edward Young, Barnaby Edward Young, Barnaby Edward Young, Lisa F. P. Ng, Lisa F. P. Ng, Lisa F. P. Ng, Laurent Renia, Laurent Renia, Laurent Renia, Jocelyn Jin Yu, Zheng Kuang Soh, Yi Qing Chin, Jonathan Jordon Lim, Juwinda Ongko, Eshele Anak Libau, Mohammed Ridzwan Bin Abdullah, Shiau Hui Diong, Jefanie Teo, He Ping Yeo