In this Wednesday, June 24, 2020 file photo, a volunteer receives a COVID-19 test vaccine injection developed at the University of Oxford in Britain, at the Chris Hani Baragwanath hospital in Soweto, Johannesburg, South Africa. Politicians and public health leaders have publicly committed to equitably sharing any coronavirus vaccine that works, but the top global initiative to make it happen may allow rich countries to reinforce their own stockpiles while making fewer doses available for poor ones