Israeli officials credit the booster shot, which has already been delivered to about a third of the population, with helping suppress the country’s latest wave of COVID-19 infections. They say the differing approaches are based on the same realization that the booster is the right way to go, and expect the U.S. and other countries to expand their campaigns in the coming months.

“The decision reinforced our results that the third dose is safe,” said Dr. Nadav Davidovitch, head of the school of public health at Israel’s Ben-Gurion University and chairman of the country’s association of public health physicians. “The main question now is of prioritization.”…

More than 3 million of Israel’s 9 million citizens have gotten a third dose of the Pfizer vaccine, according to the Health Ministry.

In a study published last week in the New England Journal of Medicine, Israeli experts said that in people who had been vaccinated five months earlier, the booster increased vaccine efficacy tenfold compared with vaccinated patients who didn’t receive it.