Will a fourth shot be needed? Is omicron really a weaker variant? Plus, why hospitals are rationing new coronavirus treatments. Get all the latest here, plus 10 charts tracing vaccination and infection.
The No. 1-ranked player is back in Serbia, ending a chapter in an elite sports drama caught up in pandemic politics. Tossed from Australia, he may not be allowed to play in the French Open, either. Here's the latest.