Study: Pfizer COVID-19 vaccine doses more effective with a 12-week gap

A new British study has found that Pfizer COVID-19 vaccine is more effective if the second dose is delayed to 12-weeks after the first. The study, which has not yet been peer reviewed—found that delaying the second dose to 12 weeks led to an antibody response that was three-and-half times larger than when vaccine doses were kept to the standard recommendation of three weeks apart