(FILE) - One of the first South African vaccine trialists gets injected during the clinical trial for a potential vaccine against the Covid-19 Corona virus at the Baragwanath hospital in Soweto, South Africa, 24 June 2020 (reissued 20 July 2020). Early phases of testing for a coronavirus vaccine suggest a positive result in immune reaction, scientists at Oxford University said 20 July 2020.  ANSA/SIPHIWE SIBEKO / POOL *** Local Caption *** 56173130