‘It’s not a simple issue of just developing a diagnostic test, it then needs to be shown to be effective.’
Listen to David Heymann explain the challenges of testing, the efficacy of face masks and what we know about immunity in his weekly briefing
https://www.chathamhouse.org/file/webinar-covid-19-weekly-pandemic-briefing-april-1?utm_source=twitter.com&utm_medium=organic-social&utm_campaign=covid-19-2020&utm_content=covid-19-briefing-audio …pic.twitter.com/94iSaNJtRu
