U.S. exceeds 400,000 coronavirus deaths The U.S. coronavirus death toll topped 400,000 on Tuesday, according to a Reuters tally, as the country hardest hit by the pandemic struggled to meet the demand for vaccines to stem the spread of infection. Anurag Maan, Roshan Abraham U.S.

(Reuters) - The U.S. coronavirus death toll topped 400,000 on Tuesday, according to a Reuters tally, as the country hardest hit by the pandemic struggled to meet the demand for vaccines to stem the spread of infection.

Conspiracies thrive in U.K. as as doctors struggle with Covid variant "In the U.K., we can look at the U.S. and take that as a warning sign of where things may be heading," one misinformation expert said. NBC News

LONDON — British front-line workers who were applauded on doorsteps in the early weeks of the pandemic now confront a torrent of polarization and misinformation.

As the COVID-19 vaccine rolls out, three big questions loom. First, can someone who has been vaccinated still spread the disease? Second, will the vaccine remain effective as the virus itself evolves? And third, how long will the vaccine's protection last?

Answers to these questions lie in our immune systems. And the answers aren't straightforward because our immune systems are both remarkably adept and remarkably challenging to predict.

...the first question, about whether people who are vaccinated can still spread the disease. Marion Pepper, an immunologist at the University of Washington, says that's not just an open question for this vaccine, but for vaccines in general.

EU kicks off debate on vaccine travel certificates European Union countries kicked off a debate on Monday on whether people who have received a COVID-19 vaccine should have greater freedom to travel in the summer than those not immunized. Philip Blenkinsop U.S.

BRUSSELS (Reuters) - European Union countries kicked off a debate on Monday on whether people who have received a COVID-19 vaccine should have greater freedom to travel in the summer than those not immunized.

A new COVID-19 challenge: Mutations rise along with cases The race against the virus that causes COVID-19 has taken a new turn: Mutations are rapidly popping up, and the longer it takes to vaccinate people, the more likely it is that a variant that can... AP NEWS

The race against the virus that causes COVID-19 has taken a new turn: Mutations are rapidly popping up, and the longer it takes to vaccinate people, the more likely it is that a variant that can elude current tests, treatments and vaccines could emerge.