The latest on the coronavirus pandemic and vaccines
What you need to know
Two members of a WHO team investigating the origins of the pandemic have been blocked from flying to China after failing a coronavirus test.
More than 90,000 Americans could die from Covid-19 in the next three weeks, according to a US CDC ensemble forecast.
The African Union secures 270 million more vaccine doses, as the continent surpasses 3 million total infections.
Past Covid infection gives five months of immunity, a UK study suggests.
Germany reports its highest ever single day death toll.