A fourth dose of Pfizer’s Covid-19 vaccine improves protection against infection and severe illness, according to an Israeli study.

The findings, published Wednesday in the New England Journal of Medicine, were based on data from 1.2 million people ages 60 years and older. About half of the participants had a fourth jab, while the rest had only the third.

The rate of severe illness among those who received a fourth dose was about three times lower than those who had received only a third dose, and the protection didn’t decline throughout the eight-week study period.

In addition, people with only three shots reported double the number of infections as those with the additional booster. However, protection against infection faded over the course of the study.... Read More: Bloomberg