以色列开始第4针

https://www.nytimes.com/2021/12/22/world/middleeast/vaccine-booster-israel-covid.html

JERUSALEM — Israel, which late last year was an early trailblazer in its efforts to administer a first coronavirus vaccine dose to its citizens, now plans to offer fourth doses in a bid to curb the rapid spread of the Omicron variant, officials said on Tuesday.

It is believed to be the first country to offer a fourth round of doses. And as with its earlier inoculation efforts, countries around the world will be looking to Israel for clues about how their own campaigns might fare.