Shava E, Izu A, Gaolathe T, Walker A, Carty L, Georgiou P, Kuate L, Kgathi C, Sekoto T, Seonyatseng N, Mogashoa T, Maphorisa C, Mohammed T, Ntalabgwe T, Frank TT, Matlhaku B, Diphoko A, Phindela T, Kaunda A, Kgari P, Kanyakula T, Palalani G, Phakedi I; (Botswana AZD1222 study team); Taylor S, Mmalane M, Moyo S, Makhema J.