Effectiveness of Pfizer vaccine considerably lower among kids against omicron variant of COVID-19: JAMA
New studies have demonstrated that the estimated effectiveness of BNT162b2 (Pfizer-BioNTech) vaccine among children and adolescents with Omicron is considerably lower than in the initial studies, and protection wanes rapidly, especially with the novel SARS-CoV-2 variants.
The findings of new research have been published in the JAMA.
The efficacy of 2 doses of the BNT162b2 COVID-19 vaccine (Pfizer-BioNTech) against COVID-19 was high in pediatric trials conducted before the SARS-CoV-2 Omicron variant emerged. Among adults, estimated vaccine effectiveness (VE) of 2 BNT162b2 doses against symptomatic Omicron infection was reduced compared with prior variants, waned rapidly, and increased with a booster.
A study was conducted to evaluate the association of symptomatic infection with prior vaccination with BNT162b2 to estimate VE among children and adolescents during Omicron variant predominance.
A test-negative, case-control analysis was conducted using data from 6897 pharmacy-based, drive-through SARS-CoV-2 testing sites across the US from a single pharmacy chain in the Increasing Community Access to the Testing platform. This analysis included 74 208 tests from children 5 to 11 years of age and 47 744 tests from adolescents 12 to 15 years of age with COVID-19–like illness who underwent SARS-CoV-2 nucleic acid amplification testing from December 26, 2021, to February 21, 2022.
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