HHS cites real-world data for Covid-19 boosters; WHO says the science is still out
In announcing plans to offer Covid-19 booster shots, the U.S. Department of Health and Human Services cited declining vaccine efficacy shown by real-world studies. But the World Health Organization said the science is less than clear about booster shots, adding that it’s ethically wrong to give third shots when so many around the world are waiting for their first one.