Millions of Americans are not getting the second doses of their Covid-19 vaccines, and their ranks are growing.More than five million people, or nearly 8 percent of those who got a first shot of the Pfizer or Moderna vaccines, have missed their second doses, according to the most recent data from the Centers for Disease Control and Prevention. That is more than double the rate among people who got inoculated in the first several weeks of the nationwide vaccine campaign.Even as the country wrestles with the problem of millions of people who are wary about getting vaccinated at all, …
