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Britain Declares National Incident After Poliovirus Found in London

Stop Kissing and Snuggling Chickens, C.D.C. Says After Salmonella Outbreak

Has the Era of Overzealous Cleaning Finally Come to an End?

Salmonella Outbreak Is Linked to Wild Birds, C.D.C. Says

The Swiss Cheese Model of Pandemic Defense

The Coronavirus Can Float in Indoor Air, W.H.O. Concedes

In Norway, Gymgoers Avoid Infections as Virus Recedes

F.D.A. Warns of Potentially Toxic Hand Sanitizers

Medical Workers Should Use Respirator Masks, Not Surgical Masks

It’s Not Whether You Were Exposed to the Virus. It’s How Much.

You’re Getting Used to Masks. Will You Wear a Face Shield?

You’re Getting Used to Masks. Will You Wear a Face Shield?

Coronavirus Does Not Spread Easily on Surfaces, C.D.C. Says

More Americans Should Probably Wear Masks for Protection

More Americans Should Probably Wear Masks for Protection

Gyms and Coronavirus: What Are the Risks?

Sneeze Into Your Elbow, Not Your Hand. Please.

Class Experiment Finds Grossest Petri Dish Came From a Bathroom Hand Dryer