Seroprevalence of COVID-19 neutralizing antibodies among multi-ethnic staff of an Asian primary healthcare institution: insights from point-of-care testing and implications for booster vaccination decisions. - Oka P; Jia H; Kongsuphol P; Ng SY; Saravanan V; Ng CJ; Moosa AS; Xiong M; Gun SY; Tsang LPM; Lim J; Vijaykumar K; et al. (BMC infectious diseases, 2025)