Covid-19 live updates: U.S. aid en route to India as new cases continue to break records

The two-dose regimen has been a workhorse of the immunization effort in the United States, accounting for more than half of the total doses administered. The new configuration will allow more primary care doctors, reluctant to accept doses that may go unused, to participate in vaccinations, said David Bazzo, president of the California Academy of Family Physicians. That, in turn, could help persuade reluctant people to get immunized.