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Pfizer vaccine's protection against COVID wanes quickly in kids ages 5-11, study says

NEW YORK, NEW YORK - OCTOBER 21: A VIP StarNETWORK medical staff member prepares a Pfizer-BioNTech coronavirus (COVID-19) vaccine at a #VAXTOSCHOOL pop-up site at Life of Hope Center on October 21, 2021 in New York City. Gov. Kathy Hochul announced yesterday the opening of 25 new coronavirus (COVID-19) vaccination pop-up sites in an initiative to help increase vaccination rates among school-aged New Yorkers. The Department of Health is working alongside local county health departments, community-based organizations, and healthcare centers to install these sites in different regions of the state. According to the state COVID-19 vaccine tracker, since October 18, 62 percent of 12 to 15-year-olds and 72 percent of 16 to 25-year-olds have received at least one coronavirus vaccine dose. (Photo by Michael M. Santiago/Getty Images)
A medical staff member prepares a Pfizer-BioNTech COVID-19 vaccine at a pop-up site in New York City last October.

The low-dose version of the Pfizer-BioNTech COVID-19 vaccine appears to be much less effective at protecting young children against infection than the higher-dose version of the vaccine given to older children and adults, a new studyshows. In all cases, the vaccine proved to provide strong protection against becoming seriously ill. The preprint study looked at data collected from more than 1.2 million fully vaccinated children and adolescents between the ages of 5 and 17 from Dec. 13 to Jan. 30. Researchers from the New York State Department of Health found the ability of the vaccine to protect children who got the lowest dose — kids ages 5 to 11 — from catching the virus dropped the most, falling from 68% to just 12%. Those children received an injection containing just 10 milligrams, one-third of the dose given to older children, adolescents and adults.Meanwhile, the effectiveness in children ages 12 to 17, who got the same 30-milligram dose as adults, showed a smaller decline, dropping from 66% to 51%. "These results highlight the potential need to study alternative vaccine dosing for children and the continued importance [of] layered protections, including mask wearing, to prevent infection and transmission," the study stated. The results of the study come just days after the Centers for Disease Control and Prevention eased masking guidelinesin many parts of the U.S. and the same day several school districts, including New York City's — the largest in the nation — announced that student mask mandates would soon be lifted. It also follows an unexpected delayin the process for an emergency use authorization for the Pfizer COVID-19 vaccine in children 6 months through 4 years of age. The company said new data emerged, and the Food and Drug Administration said it needed more time to evaluate the data. Copyright 2022 NPR. To see more, visit https://www.npr.org.