We Still Don’t Know How Well Covid Vaccines Stop Transmission

Two new studies are being hailed as proof that vaccinated people can doff masks and pod-hop worry-free. But not so fast.

This week, the US passed a grim milestone in the ongoing coronavirus crisis: 500,000 deaths, more than the number of Americans killed in World War II, the Korean War, and the Vietnam War combined. And yet there is a growing sense of hope that the worst might now be behind us. With new cases declining and immunizations accelerating—45.2 million people have so far received at least one dose of a Covid-19 vaccine, including 20.6 million who have been fully vaccinated—many Americans are beginning to allow themselves

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