Opinion | We Need to Start Traveling Again. Here’s How.

We need a global vaccine certification system to ease international trade and trips.

U.S. Authorities Seek Documents From Troubled Covid Vaccine Manufacturer

Emergent BioSolutions, which ruined 75 million vaccine doses at its Baltimore plant, disclosed records requests from Congress and federal and state law enforcement agencies.

Some Are Chasing Extra Vaccine Shots, While Scientists Debate

Boosters may not be necessary yet, many experts say, and the pursuit of additional shots raises ethical questions.

J.&J. Vaccine May Be Less Effective Against Delta, Study Suggests

Many who received the shot may need to consider boosters, the authors said. But federal health officials do not recommend second doses.

Delta Variant Widens Gulf Between ‘Two Americas’: Vaccinated and Unvaccinated

Data from overseas, particularly Britain, suggest the spread of the virus will set vaccinated and unvaccinated communities on very different paths.

Citing the Delta Variant, Pfizer Will Pursue Booster Shots and a New Vaccine

Scientists were critical of the announcement, pointing to evidence that the current two-dose regimen is powerfully effective against the coronavirus.

Three Studies, One Result: Vaccines Point the Way Out of the Pandemic

New scientific research underscores the effectiveness of vaccines and their versatility in the fight against the coronavirus.

Why More People Are Getting Two Different Coronavirus Vaccines

Several countries are allowing mix-and-match inoculation, which scientists hope will have benefits, and Chancellor Angela Merkel of Germany is among those to get it.

The Struggles of India’s Vaccine Giant

How an export ban has left millions of people without coronavirus vaccines and imperiled the reputation of the Serum Institute of India, the world’s largest vaccine maker.

‘Springsteen on Broadway’ is returning, but not for guests who haven’t had F.D.A.-authorized vaccines.

The venue, New York’s St. James Theatre, is making no exceptions for people who are unable or unwilling to be vaccinated.

Vaccine Maker Earned Record Profits but Delivered Disappointment in Return

Emergent BioSolutions was awarded a $628 million federal contract with no competitive bidding. Top executives received big bonuses while factories mostly sat idle and tens of millions of Covid-19 doses were thrown away.

F.D.A. details failures at a Baltimore plant that led to unusable vaccine doses.

The F.D.A. advised Johnson & Johnson on Friday that it should throw out the equivalent of 60 million doses produced at the Baltimore plant.

AstraZeneca Vaccine Carries Slightly Higher Risk of Bleeding Disorders, Study Shows

But the research, involving 2.53 million adults in Scotland, found that the vaccine’s benefits outweighed the small risks.

First U.S. Vaccine Donations Will Go to ‘Wide Range’ of Nations in Need

Latin America, South and Southeast Asia and Africa will be among the recipients of an initial 25 million excess doses that the Biden administration is sharing this month.

New Variant Posing Threat, as Global Vaccine Drive Falters

The coronavirus variant first seen in India is rapidly outpacing all others in Britain, a problem for the U.K. and a potential new burden on poorer nations.

‘This Day Was Bound to Come’: Taiwan Confronts a Covid Flare-Up

The island’s border controls had shielded it from the worst of the pandemic. But new variants and slow vaccinations gave the virus an opening.