Virologist Barry Schoub: South Africa's covid situation 'is bleak'

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South Africa is now grappling with a highly transmissible new strain of Covid-19 that is causing international concern. Stephen Sackur interviews Professor Barry Schoub, virologist and Chair of the South African Government’s Advisory Committee on Covid-19 vaccines. What does the country’s Covid crisis mean for the worldwide effort to end the pandemic? (Photo: Professor Barry Schoub appears via video link on Hardtalk)