News Wrap: Pfizer says its booster protects against omicron

In our news wrap Wednesday, drug maker Pfizer says its double-dose vaccine — plus a booster — may offer significant protection against the omicron variant. Olaf Schultz has officially become Germany's chancellor — marking the end of Angela Merkel's 16-year tenure. Canada and Britain are the latest to join the U.S. diplomatic boycott of the Winter Olympics in China.