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What Is Monkeypox?

Is Covid More Dangerous Than Driving? How Scientists Are Parsing Covid Risks.

Is This What Endemic Disease Looks Like?

A guide to vaccine boosters.

See How Vaccines Can Make the Difference in Delta Variant’s Impact

Here’s what to know about breakthrough infections and the Delta variant.

Israeli Data Suggests Possible Waning in Effectiveness of Pfizer Vaccine

Pfizer’s shot remains strong against disease, but Israeli data raise the prospect of it waning against infection.

The world is worried about the Delta virus variant. Studies show vaccines are effective against it.

We’ll Probably Need Booster Shots for Covid-19. But When? And Which Ones?

How to Think Like an Epidemiologist