Covert COVID-19 and false-positive dengue serology in Singapore. Issue 5 (May 2020) - Yan, Gabriel; Lee, Chun Kiat; Lam, Lawrence T M; Yan, Benedict; Chua, Ying Xian; Lim, Anita Y N; Phang, Kee Fong; Kew, Guan Sen; Teng, Hazel; Ngai, Chin Hong; Lin, Li; Foo, Rui Min; et al.