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A new study sheds light on the elusive idea of herd immunity NPR's Asma Khalid speaks with Mahan Gafari, an epidemiologist at the University of Oxford, about the state of the pandemic in Iran and what we can learn about herd immunity.

A new study sheds light on the elusive idea of herd immunity

Heard on Weekend Edition Sunday

A new study sheds light on the elusive idea of herd immunity

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Countries around the globe have tried lifting pandemic restrictions in the hopes that somehow getting herd immunity will stop the spread of the virus, only to see more coronvarius infections.

A new study focusing on Iran sheds light on what happens when we try to control the spread of COVID-19 through the notion of herd immunity over other measures — say like shutdowns or vaccines.