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What Do We Owe Lab Animals?

New Covid Pills Offer Hope as Omicron Looms

Merck says its antiviral pill is less effective in a final analysis.

J. & J. finds that a second dose of its vaccine provides a strong boost.

New data suggest J. & J. vaccine works against Delta and recipients don’t need a booster shot.

Some Are Chasing Extra Vaccine Shots, While Scientists Debate

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?

Coronavirus Vaccine Tracker

How Moderna’s Vaccine Works

How Pfizer’s Vaccine Works

Vaccine Makers Keep Safety Details Quiet, Alarming Scientists

F.D.A. ‘Grossly Misrepresented’ Blood Plasma Data, Scientists Say

F.D.A. ‘Grossly Misrepresented’ Blood Plasma Data, Scientists Say

A Possible Weapon Against the Pandemic: Printing Human Tissue

Coronavirus Vaccine Tracker