Drug company workers, government officials and others have been injected outside the usual testing process. More will be soon, bewildering experts who worry about potential ill effects.
We may not find out whether the vaccines prevent moderate or severe cases of Covid-19.
Americans will need to take pandemic precautions well into 2021 — yes, even after a vaccine arrives.
The company said tests of its vaccine would start up again in Britain while remaining suspended in the U.S. and other countries. Pfizer, a competitor, announced an expansion of its trials.
New details of how the president has demanded faster action from health agencies help explain the intensifying concern that he could demand pre-Election Day approval of a vaccine.
The intelligence wars over vaccine research have intensified as China and Russia expand their efforts to steal American work at both research institutes and companies.
Dozens of research groups around the world are playing the long game, convinced that their experimental vaccines will be cheaper and more powerful than the ones leading the race today.
In what may be the world’s most important math puzzle, researchers are trying to figure out how many people in a community must be immune before the coronavirus fades.
The goal of the initiative is admirable: getting a coronavirus vaccine out to Americans and saving lives as soon as possible. It is not, however, without its problems.
There’s no vaccine for Covid-19, but there’s one for influenza. With the season’s first doses now shipping, officials are struggling over how to get people to take it.
Widespread contagion, a deep bench of scientists and a robust vaccine-making infrastructure have made Brazil an important player in the quest to find a vaccine.
The world’s largest vaccine producer, the Serum Institute, announced a plan to make hundreds of millions of doses of an unproven inoculation. It’s a gamble with a huge upside. And huge risks.