The C.D.C. found 43 Omicron cases, almost all of them mild, in the first week of December.

Global roundup A Covid-19 intensive care unit at University Hospital Leipzig last month. German lawmakers voted on Friday to make coronavirus vaccines obligatory for health care workers.Credit…Jens Schlueter/Getty Images German lawmakers voted on Friday to make coronavirus vaccines obligatory for health care workers — a significant move in a nation where protests against pandemic restrictions…