Recommending Covid-19 booster shot will be premature: WHO scientist

More-transmissible strains are prompting vaccine makers to test whether tweaked versions of their existing shots will provide broader immunity.

As some governments and pharmaceutical officials prepare for Covid booster shots targeting more-infectious virus variants, health authorities say it’s too early to tell if they will be required.

“We do not have the information that’s necessary to make the recommendation on whether or not a booster will be needed,” Soumya Swaminathan, the World Health Organization’s chief scientist, said in a Zoom interview Friday. The “science is still evolving.”

Such a call is “premature” while high-risk individuals in most of the world haven’t yet completed a first course of vaccination, Swaminathan said. Data from countries introducing precautionary extra inoculations later this