Seroprevalence of SARS-CoV-2 infection in the Colombo Municipality region, Sri Lanka by Jeewandara, C, Guruge, D, Abyrathna, IS, Danasekara, S, Gunasekera, B, Pushpakumara, PD, Madhusanka, D, Jayathilaka, D, Ranasinghe, T, Somathilake, G, Tanussiya, S, Jayadas, TT, Kuruppu, H, Thashmi, N, Harvie, M, Wijayamuni, R, Schimanski, L, Tan, TK, Rijal, P, Xiao, J, Ogg, GS, Townsend, A, Malavige, GN