The immune system plays a vital role in protecting humans from infections, but how is it faring against covid-19? Pascal Soriot, chief executive of the pharmaceutical giant AstraZeneca, tells host, Kenneth Cukier, about potential treatments for covid patients. Plus, do people build up an immunity to covid-19 if they have recovered from it, or can they catch it again? And, Sonja Lyubomirsky, professor of psychology at the University of California, Riverside, on how acts of kindness can boost the immune system.

Read The Economist’s full coverage of the coronavirus.

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