Feb 2, 2021 12:22pm Primary care doctors provide nearly half of all vaccines in the U.S. and their role may help assure successful delivery of the COVID-19 vaccines to communities across the nation, according to a study. (Getty/Geber86) Vaccinating millions of Americans against the COVID-19 virus is proving to be a complicated process already plagued with many setbacks. But there's already a ready-made vaccine distribution system that can be tapped into to accelerate the rollout, some experts say: primary care doctors. Primary care doctors provide nearly half of all vaccines in the U.S. and their role may help assure successful delivery of the COVID-19 vaccines to communities across the nation, including rural and remote communities, according to a preprint study published in the Annals of Family Medicine.