The logo and building of the World Health Organization (WHO) headquarters in Geneva, Switzerland, 15 April 2020. An expert group convened by the World Health Organization says there may be some benefit to giving a second booster dose of coronavirus vaccine to the most vulnerable people amid the continuing global spread of omicron and its subvariants. In a statement issued on Tuesday, May 17 2022 the U.N. health agency said there was increasing evidence that a second booster dose of COVID-19 vaccine would benefit health workers, people over age 60 and those with weak immune systems. (Martial Trezzini/Keystone via AP, file)
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