The makers of COVID-19 vaccines are figuring out how to tweak their recipes against worrisome virus mutations — if and when the shots need an update.

Will Vaccines Protect Us From the Delta Variant?

The Brian Lehrer Show | Jul 1, 2021

Nsikan Akpan, WNYC's health and science editor, discusses what risk the Delta variant poses to unvaccinated -- and even vaccinated -- Americans.

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