Immune responses to a single dose of the AZD1222/Covishield vaccine in health care workers by Jeewandara, C, Kamaladasa, A, Pushpakumara, PD, Jayathilaka, D, Aberathna, IS, Danasekara, DRSR, Guruge, D, Ranasinghe, T, Dayarathna, S, Pathmanathan, T, Somathilake, G, Deshan Madhusanka, PA, Ramu, ST, Pramanayagam Jayadas, TT, Kuruppu, H, Wijesinghe, A, Thashmi Nimasha, HM, Milroy, D, Nandasena, AA, Nilanka Sanjeewani, PKG, Wijayamuni, R, Samaraweera, S, Schimanski, L, Tan, TK, Dong, T, Ogg, GS, Townsend, A, Malavige, GN