A study in New York found that the vaccine's efficacy rate fell to 51% from 66% just a month earlier.
FILE - A dose of a Pfizer COVID-19 vaccine is prepared at Lurie Children's hospital, Nov. 5, 2021, in Chicago. Some people getting Pfizer or Moderna COVID-19 vaccines should consider waiting up to eight weeks between the first and second doses, instead of the three or four weeks previously recommended, U.S. health officials said.,Tuesday, Feb. 22, 2022.
It varied from people aged 12 to 17, where the study found its efficacy fell to 51% in late January from 66% in mid-December.The nation’s 19 million children under 5 are the only group not yet eligible for vaccination against the coronavirus. Many parents have been pushing for an expansion of shots to toddlers and preschoolers, especially as the omicron variant sent record numbers of youngsters to the hospital.
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