Biden Falls Short on Pledge for U.S. to Be the World’s Vaccine ‘Arsenal,’ Experts Say

Congress appropriated $16 billion to ramp up Covid-19 countermeasures, but a new report found that the Biden administration had spent very little of it on expanding vaccine manufacturing capacity.

Novavax Says U.S. Will Pause Funding for Production of Its Vaccine

The Maryland company, which has a $1.75 billion federal contract to develop and produce a coronavirus vaccine, said it needed to address the concerns of federal regulators.

Covid Is Especially Risky for People With H.I.V., Large Study Finds

An H.I.V. infection increases the odds of dying from Covid-19 by at least 30 percent, researchers said.

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.

NATO, Crime, Jupiter: Your Monday Evening Briefing

Here’s what you need to know at the end of the day.

Novavax Offers U.S. a Fourth Strong Covid-19 Vaccine

The company’s large U.S. trial found an efficacy rate of about 90 percent. But at this point, the nation is awash in other shots.