Pfizer vaccine provides 90 percent protection against hospitalization for six months, study finds.

The findings, which also document a waning of protection against infection, come as officials debate the necessity and timing of booster shots.

With Biden’s Agenda in the Balance, Lobbying Kicks Into High Gear

Business interests are using ads and other efforts to cajole Democrats to change or kill a $3.5 trillion social policy bill.

Europe’s drug regulator said a booster shot of the Pfizer-BioNTech vaccine could be given to healthy adults.

The European Medicines Agency also said that extra doses of the Moderna and Pfizer-BioNTech vaccines could be given to people with underlying health conditions as early as 28 days after a second dose.

Johnson & Johnson to Seek F.D.A. Authorization for Booster Shot

The request, expected this week, comes after a study found the company’s vaccine was only 71 percent effective against hospitalization from Covid-19.

Johnson & Johnson to Seek F.D.A. Authorization for Booster Shot

The request, expected this week, comes after a study found the company’s vaccine was only 71 percent effective against hospitalization from Covid-19.

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

President Biden’s Covid adviser also says it is “too soon to tell” if the Delta surge will decline enough to allow safe gatherings around the holidays.

What You Need to Know About Merck’s New Covid Treatment Pill

The pills are effective and relatively cheap, but they are unlikely to be available for everyone with Covid.

Merck Says It Has the First Antiviral Pill Found to Be Effective Against Covid

The drug maker will seek authorization for molnupiravir, the first drug of its kind for Covid. Experts said such pills could be a powerful tool against the virus.

Opinion | Was the Decision on Boosters Bungled?

Readers discuss the government’s handling of the issue. Also: Abortion stories; criminal justice reform; voice recognition; extinct species.

Merck says it has the first antiviral pill found to be effective against Covid.

The drug maker will seek authorization for molnupiravir, the first drug of its kind for Covid. Experts said such pills could be a powerful tool against the virus.

How Covid Misinformation Created a Run on Animal Medicine

Veterinarians, ranchers and farmers say they are struggling with the effects of the surging demand for ivermectin, a deworming drug.

The Hidden Drug Epidemic Among Older People (Published 2019)

People in their 60s take an average of 15 prescription drugs a year. Combined with over-the-counter products, they may do more harm than good.

Cancer Without Chemotherapy: ‘A Totally Different World’

A growing number of cancer patients, especially those with breast and lung cancers, are being spared the dreaded treatment in favor of other options.

Falls Can Kill You. Here’s How to Minimize the Risk. (Published 2019)

Falls are the leading cause of fatal and nonfatal injuries among older adults. Every 19 minutes in this country, an older person dies from a fall.

Pressure Grows on U.S. Companies to Share Covid Vaccine Technology

Moderna accepted $2.5 billion in taxpayer money to develop its Covid-19 vaccine. But officials in the U.S. and overseas are having trouble persuading the company to license its technology.

Opinion | It’s All or Nothing for These Democrats, Even if That Means Biden Fails

The moderates’ immodest demands threaten the president’s agenda.

Opinion | It’s All or Nothing for These Democrats, Even if That Means Biden Fails

The moderates’ immodest demands threaten the president’s agenda.

Specialty Pharmacies Cater to the Blind and Those With Impaired Vision

The pandemic has exposed flaws in services for people who can’t easily access a drive-through window for Covid shots or testing or can’t read prescription labels.

Opinion | What Is 23andMe Doing With Your DNA?

C.E.O. Anne Wojcicki grapples with the ethical questions that come with building a business on customers’ personal information.

Opinion | Why Covid Vaccines for Kids Are Taking So Long

The F.D.A. needs a new system for responding to pandemics.