As Pandemic Gap Widens, U.S. Expands Vaccinations to Adolescents

This week, nearly 17 million more people in the U.S. became eligible for a Covid-19 shot, after the CDC formally recommended a vaccine for kids aged 12 to 15. The announcement heralds a new phase of the mass vaccination campaign — even as it widens the gap between the U.S. and many other parts of the world.