Effectiveness of BNT162b2 Vaccine against Omicron Variant Infection among Children 5-11 Years of Age, Israel

Aharona Glatman-Freedman, Yael Hershkovitz, Rita Dichtiar, Alina Rosenberg, Lital Keinan-Boker, Michal Bromberg

Research output: Contribution to journalArticlepeer-review

Abstract

We assessed effectiveness of the BNT162b2 vaccine against infection with the B.1.1.529 (Omicron) variant (mostly BA.1 subvariant), among children 5-11 years of age in Israel. Using a matched case-control design, we matched SARS-CoV-2-positive children (cases) and SARS-CoV-2-negative children (controls) by age, sex, population group, socioeconomic status, and epidemiologic week. Vaccine effectiveness estimates after the second vaccine dose were 58.1% for days 8-14, 53.9% for days 15-21, 46.7% for days 22-28, 44.8% for days 29-35, and 39.5% for days 36-42. Sensitivity analyses by age group and period demonstrated similar results. Vaccine effectiveness against Omicron infection among children 5-11 years of age was lower than vaccine efficacy and vaccine effectiveness against non-Omicron variants, and effectiveness declined early and rapidly.

Original languageEnglish
Pages (from-to)771-777
Number of pages7
JournalEmerging Infectious Diseases
Volume29
Issue number4
DOIs
StatePublished - Apr 2023

Bibliographical note

Publisher Copyright:
© 2023 Centers for Disease Control and Prevention (CDC). All rights reserved.

ASJC Scopus subject areas

  • Microbiology (medical)
  • Infectious Diseases
  • Epidemiology

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