President Trump changed tone and course this week, extending federal guidelines on social distancing to the end of April. New York is now the epicentre of the global pandemic. Yet large parts of the US remain relatively unaffected by covid-19. Public opinion supports tough measures to contain the virus for now. But how sustainable are strict curbs on personal freedom in a country founded on individual liberty?

The Economist’s healthcare correspondent Slavea Chankova explains the epidemiological models behind the lockdown, we tell the story of history’s most notorious asymptomatic carrier, and Senator Cory Booker reflects on political division in national crises.

John Prideaux, The Economist’s US editor, hosts with Charlotte Howard, New York bureau chief, and Washington correspondent Jon Fasman.

Read The Economist’s full coverage of the coronavirus.

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