AstraZeneca COVID-19 vaccine doses have better efficacy when given 12 weeks apart, study finds

Waiting three months between the first and second dose of the AstraZeneca COVID-19 vaccine results in high efficacy, backing current recommendations from Australian authorities, new research shows. The study, which involved more than 17,000 participants and was published recently in The Lancet, found the vaccine — which most people in Australia will receive — had an 81 per cent efficacy rate when a second dose was given three months after the first.