Both vaccines require two shots, and Pfizer had recommended that the second dose be given within 21 days of the first. It has stretched out the time between the doses from 21 days to within 12 weeks. While two doses are required to fully protect against COVID-19, both vaccines provide high levels of protection after the first dose, the committee said. Making the first dose the priority will “maximize benefits from the vaccination program in the short term,” it said. “When resources of doses and people to vaccinate are limited, then vaccinating more people with potentially less efficacy is demonstrably better than a fuller efficacy in only half.”

Source: Daily Sun January 04, 2021 20:36 UTC