COVID-19 Vaccine Breakthrough Infections: Alpha and Iota Variants Dominate in New York City

Strategic Insights -

COVID-19 vaccine breakthrough infections, where individuals contract the virus despite being fully vaccinated, remain a concern. Recent research published in the Journal of Clinical Investigation has shed light on the makeup of these breakthrough cases in metropolitan New York. The study compared the SARS-CoV-2 genomes of 76 breakthrough cases after full vaccination with BNT162b2, mRNA-1273, or JNJ78436735 to unvaccinated controls in February-April 2021. The research found that most breakthrough infections (57/76) occurred with the Alpha (B.1.1.7) or Iota (B.1.526) variants, with the median age of patients being 48 years. The study's findings highlight the high vaccine efficacy against these variants and emphasize the importance of continued genomic analysis to understand immune escape mechanisms.

Key Takeaways:

  • The study analyzed 76 COVID-19 vaccine breakthrough cases after full vaccination with BNT162b2, mRNA-1273, or JNJ78436735 in metropolitan New York.
  • The median age of patients in the study was 48 years, with 7 patients requiring hospitalization, including 1 death.
  • Most breakthrough infections (57/76) occurred with the Alpha (B.1.1.7) or Iota (B.1.526) variants, with the vast majority (42/76) being infected with B.1.1.7.
  • Both unmatched and matched statistical analyses considering age, sex, vaccine type, and study month as covariates supported the null hypothesis of equal variant distributions between vaccinated and unvaccinated individuals.
  • The study found no clear association between the type of vaccine received and the variant.
  • Spike mutations in the N-terminal domain and receptor-binding domain, associated with immune evasion, were overrepresented in the vaccinated group.

Statistics:

  • 76 COVID-19 vaccine breakthrough cases were analyzed in the study.
  • 57/76 breakthrough infections occurred with the Alpha (B.1.1.7) or Iota (B.1.526) variants.
  • 42/76 breakthrough infections were infected with B.1.1.7.
  • 7/76 patients required hospitalization, including 1 death.
  • The median age of patients in the study was 48 years.

Sources:

  • Dominance of Alpha and Iota Variants In Sars-cov-2 Vaccine Breakthrough Infections In New York City. Journal of Clinical Investigation, 2021;131(18).
  • New York University (NYU) Grossman School of Medicine, Department of Microbiology.
  • Amer Soc Clinical Investigation Inc, 2015 Manchester Rd, Ann Arbor, MI 48104, USA.