What is herd immunity? Why do we need to wait for a vaccine before trying to achieve herd immunity? Why can't we just let everyone get infected?
WHO’s Chief Scientist, Dr Soumya Swaminathan explains.
This is a video in the series 'Science in 5 on COVID-19', in which WHO experts answer questions on COVID-19 - in about 5 minutes.
Published 29 August 2020.