Procedures

New strain of coronavirus splits scientists as UK and others act to stop spread

BioNTech boss says more tests are needed to see if vaccine protects against new COVID-19 strain

Covid-19 variant may make herd immunity more difficult, BioNTech says

Hospitals are contending with tensions over who will receive the first Covid-19 vaccines

The year in space travel

Sinovac’s Covid-19 vaccine shown effective in trials in Brazil

Sinovac’s Covid-19 vaccine shown effective in trials in Brazil

Should you be concerned about the new COVID-19 strain? Here’s What You Need to Know

US officials urge calm about new Covid-19 tribe abroad

Moderna begins shipping its COVID-19 vaccine in the US