POPVAC programmeMedical Research CentreMR/R02118X/1https://doi.org/10.13039/501100020643POPVAC programmeMedical Research CentreMC_PC_21034https://doi.org/10.13039/501100020643VAnguardNational Institute for Health and Care ResearchNIHR134531https://doi.org/10.13039/501100000272CoHost ProjectScience for Africa FoundationGCA/SARSCov2-2-20-002https://doi.org/10.13039/100031746