Immune responses to a single dose of the AZD1222/Covishield vaccine at 16 weeks in individuals in Sri Lanka by Jeewandara, C, Guruge, D, Pushpakumara, PD, Kamaladasa, A, Aberathna, IS, Ramu, ST, Gunasekera, B, Wijesinghe, A, Dissanayake, O, Kuruppu, H, Ranasinghe, T, Jayathilaka, D, Dayarathna, S, Ekanayake, D, Jayamali, J, Gamalath, N, Mudunkotiwa, A, Somathilake, G, Dissanayake, M, Harvie, M, Nimasha, T, Madusanka, D, Jayadas, T, Wijayamuni, R, Schimanski, L, Rijal, P, Tan, TK, Townsend, A, Ogg, GS, Malavige, GN