10 December 2021 | 15:31 Asia/Singapore NUS to run year-long study to determine immunity of children against COVID-19 The Straits Times Online, 10 December 2021The Straits Times Online, 11 December 20218world Online, 11 December 2021Berita Harian Online, 11 December 2021Tamil Murasu, 11 December 2021, p2zbSunday, 12 December 2021, p2Hao 96.3FM, 12 December 2021