A health worker shows a vial of AstraZeneca-Oxford’s Covid-19 coronavirus vaccine, at Patan Hospital near Kathmandu on January 27, 2021.
PRAKASH MATHEMA | AFP | Getty Images
LONDON — The U.K.’s decision to delay the second shot of the AstraZeneca-University of Oxford coronavirus vaccine has been found to be an effective strategy, according to a new study.
Oxford researchers found that the Covid vaccine was 76% effective at preventing symptomatic infection for three months after a single dose, and in fact that the efficacy rate rose with a longer interval between the first and second doses.
A delay in the second dose means more people can get their first vaccines sooner because it eases a…