With supplies from Johnson & Johnson set to fall 86 percent, a White House official warned that the vaccine would be scarce until a troubled Baltimore plant gains regulatory approval.

An Operation Warp Speed report last June flagged staffing and quality control concerns at Emergent BioSolutions’ factory in Baltimore. The troubled plant recently had to throw out up to 15 million...

The Baltimore plant that recently had to scrap up to 15 million ruined doses had flouted rules and downplayed errors, according to internal audits, ex-employees and clients. Other doses had to be...

As U.S. manufacturers hit their stride, vaccine scarcity will soon turn to plenty as much of the world goes begging. And vaccine makers need answers now about what to do with the coming surplus.

As U.S. manufacturers hit their stride, vaccine scarcity will soon turn to plenty as much of the world goes begging. And vaccine makers need answers now about what to do with the coming surplus.

Opposition to restrictive Republican voting laws — and support for a sweeping Democratic bill — fuels a movement like none in decades. But can it succeed?

Trump administration officials grumble that they laid the groundwork for surging vaccinations, but some hard work in the trenches has helped pick up the pace of production.

At least 37 states allow people with certain health conditions to receive the Covid-19 vaccine, according to a New York Times survey. But a new skirmish has emerged over who will go first.

Johnson & Johnson’s one-shot vaccine is allowing states to rethink distribution, even as health officials and experts worry some will view it as inferior.

A day at one mass site in Connecticut shows both the promise and the shortcomings of the approach, which is at the center of President Biden’s plan to bring the pandemic to an end.

The authorization of a third Covid-19 vaccine will bring millions more doses within days. But health officials worry that some people will see the vaccine as the inferior choice.

Republican legislators want big changes to the laws for elections and other aspects of governance. A fight over the ground rules for voting may follow.

A high school freshman created a team of volunteers to help hundreds of people register for their shots as opportunities to get vaccinated remain elusive.