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About 20% of the adult population has received at least one dose of a covid vaccine. And while there are early signs amongst health workers and those over 60 of a positive impact, it’s unlikely we will prevent a fourth wave. And as tonight’s latest figures show, we are certainly not out of the woods. Professor Shabhir Madhi, vaccinologist and director of the vaccines and infectious diseases analytical research unit at Wits University spoke to Sally Burdett. #DStv403