Reinfections across the country are being driven by an explosion in cases of BA.5, the latest variant of COVID-19. Andy asks Harvard epidemiologist Bill Hanage whether our vaccines and immune systems have a fighting chance, if infections are more severe than other Omicron offshoots, and what we need to do to safely get through the summer and fall. Will those who have managed to avoid the virus for years finally succumb to this wave? Find out.

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Follow Bill Hanage on Twitter @BillHanage.

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