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New A.L.S. Treatment Lacks Evidence of Benefit, F.D.A. Panel Finds

Ivermectin Does Not Reduce Risk of Covid Hospitalization, Large Study Finds

Halting Progress and Happy Accidents: How mRNA Vaccines Were Made

J&J’s booster shot provides strong protection against severe disease from Omicron, a study says.

A Popular Test Claims to Boost I.V.F. Success. The Science Is Unclear.

A Popular Test Claims to Boost I.V.F. Success. The Science Is Unclear.

A Cure for Type 1 Diabetes? For One Man, It Seems to Have Worked.

Pfizer Says Its Antiviral Pill Is Highly Effective in Treating Covid

Mix-and-Match Covid Boosters: Why They Just Might Work

Data from Federal Scientists Raise Questions About J.&J. Booster Shots

Fauci says Americans should get vaccinated even if Merck’s Covid pill cuts deaths.

A study finds no signs of trouble in getting flu and Covid shots at the same time.

Pfizer and BioNTech Submit Data Backing Vaccine for Children 5 to 11

Moderna vs. Pfizer: Both Knockouts, but One Seems to Have the Edge

Pioneering Gene Therapy Freed Her of Sickle Cell. Is a Cure at Hand?

I’m Haunted by Sisters With Sickle Cell: Two Thrived. Two Suffered.

Parents of Young Children Desperately Seek Vaccine Trials

The F.D.A. again warns parents not to get children under 12 vaccinated yet.

The F.D.A. again warns parents not to get children under 12 vaccinated yet.

An Experimental H.I.V. Vaccine Fails in Africa