The US State Department says Secretary of State Mike Pompeo is in quarantine after coming into contact with a person who tested positive for the coronavirus.
The US regulator on Tuesday released new data confirming Moderna's Covid-19 vaccine was safe and effective, a strong sign that it could receive emergency approval in days and be ready to roll out by next week.
French-Austrian biotech firm Valneva said Wednesday it will begin clinical trials of its Covid-19 vaccine candidate in Britain, where the government has already ordered at least 60 million doses.