(Reuters) -The U.S. Food and Drug Administration has authorized the https://www.fda.gov/media/150386/download use of a third dose of the Pfizer and BioNTech COVID-19 vaccine for children aged between 12 and 15 years, and narrowed the time for all booster shots by a month to five months after the primary doses. The agency on Monday also authorized a third shot in children aged 5 through 11 years who are immunocompromised. The regulatory decisions come as COVID-19 cases surge due to the Omicron variant, with health authorities warning that its high transmissibility could overwhelm many health sy…

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