Emerging Infectious Diseases (Feb 2022)

Effectiveness of mRNA BNT162b2 Vaccine 6 Months after Vaccination among Patients in Large Health Maintenance Organization, Israel

  • Jennifer Kertes,
  • Sharon Baruch Gez,
  • Yaki Saciuk,
  • Lia Supino-Rosin,
  • Naama Shamir Stein,
  • Miri Mizrahi-Reuveni,
  • Anat E. Zohar

DOI
https://doi.org/10.3201/eid2802.211834
Journal volume & issue
Vol. 28, no. 2
pp. 338 – 346

Abstract

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Israel experienced a new wave of coronavirus disease during June 2021, six months after implementing a national vaccination campaign. We conducted 3 discrete analyses using data from a large health maintenance organization in Israel to determine whether IgG levels of fully vaccinated persons decrease over time, describe the relationship between IgG titer and subsequent PCR-confirmed infection, and compare PCR-confirmed infection rates by period of vaccination. Mean IgG levels steadily decreased over the 6-month period in the total tested population and in all age groups. An inverse relationship was found between IgG titer and subsequent PCR-positive infection. Persons vaccinated during the first 2 months of the campaign were more likely to become infected than those subsequently vaccinated. The vaccinated group >60 years of age had lower initial IgG levels and were at greater risk for infection. The findings support the decision to add a booster vaccine for persons >60 years of age.

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