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NTUZUMA, South Africa — A few months ago, Sizakele Mathe, a community health worker in this sprawling hillside township on the edge of the city of Durban, was notified by a clinic that a neighbor had stopped picking up her medication. It was a warning...

France imposed new rules on travelers from outside the European Union to slow the spread of the omicron variant and German Chancellor Angela Merkel devoted her last weekly message to a plea to the unvaccinated.

Need to find a booster? Here's what we know about mixing COVID vaccines.

Six more U.S. states confirmed their first cases of the Covid-19 omicron variant, as experts warned the delta variant will likely be a bigger threat in winter.