New data confirms three vaccine doses offer much greater protection from Delta and Omicron hospitalisations.
Booster doses of the Pfizer and Moderna vaccines offer improved protection against hospitalisations due to Covid-19 variants, new studies show.
According to the CDC study, vaccine effectiveness against hospitalisation after two doses was 90% until six months after the second dose but fell to 81% afterwards.During the more recent surge in Omicron cases, the rate of effectiveness after two doses stood at 81% from the two weeks to six month-mark, before falling to 57%. Two weeks after the booster, effectiveness rose to 90%.
A separate study, published in the Journal of the American Medical Association, determined that the chances of contracting Covid-19 and developing symptoms was 66% lower for those who have received a booster.