Immunogenicity, reactogenicity, and safety of a second booster with BNT162b2 or full-dose mRNA-1273: A randomized VACCELERATE trial in adults aged ≥75 years (EU-COVAT-1-AGED Part B)

Int J Infect Dis. 2024 Sep:146:107161. doi: 10.1016/j.ijid.2024.107161. Epub 2024 Jul 9.

Abstract

Objectives: To assess the safety and immunogenicity of a fourth vaccination (second booster) in individuals aged ≥75 years.

Methods: Participants were randomized to BNT162b2 (Comirnaty, 30 µg) or messenger RNA (mRNA)-1273 (Spikevax, 100 µg). The primary end point was the rate of two-fold antibody titer increase 14 days after vaccination, targeting the receptor binding domain (RBD) region of wild-type SARS-CoV-2. The secondary end points included changes in neutralizing activity against wild-type and 25 variants. Safety was assessed by monitoring solicited adverse events (AEs) for 7 days.

Results: A total of 269 participants (mean age 81 years, mRNA-1273 n = 135/BNT162b2 n = 134) were included. Two-fold anti-RBD immunoglobulin (Ig) G titer increase was achieved by 101 of 129 (78%) and 116 of 133 (87%) subjects in the BNT162b2 and the mRNA-1273 group, respectively (P = 0.054). A second booster of mRNA-1273 provided higher anti-RBD IgG geometric mean titer: 21.326 IU/mL (95% confidence interval: 18.235-24.940) vs BNT162b2: 15.181 IU/mL (95% confidence interval: 13.172-17.497). A higher neutralizing activity was noted for the mRNA-1273 group. The most frequent AE was pain at the injection site (51% in mRNA-1273 and 48% in BNT162b2). Participants in the mRNA-1273 group had less vaccine-related AEs (30% vs 39%).

Conclusions: A second booster of either BNT162b2 or mRNA-1273 provided substantial IgG increase. Full-dose mRNA-1273 provided higher IgG levels and neutralizing capacity against SARS-CoV-2, with similar safety profile for subjects of advanced age.

Keywords: Advanced age; Booster vaccination; Immunosenescence; Neutralizing antibodies; SARS-CoV-2; Variants of concern.

Publication types

  • Randomized Controlled Trial

MeSH terms

  • 2019-nCoV Vaccine mRNA-1273* / immunology
  • Aged
  • Aged, 80 and over
  • Antibodies, Neutralizing* / blood
  • Antibodies, Viral* / blood
  • BNT162 Vaccine* / immunology
  • COVID-19 Vaccines / administration & dosage
  • COVID-19 Vaccines / adverse effects
  • COVID-19 Vaccines / immunology
  • COVID-19* / immunology
  • COVID-19* / prevention & control
  • Female
  • Humans
  • Immunization, Secondary*
  • Immunogenicity, Vaccine*
  • Immunoglobulin G / blood
  • Male
  • SARS-CoV-2* / immunology
  • Spike Glycoprotein, Coronavirus / immunology

Substances

  • BNT162 Vaccine
  • Antibodies, Viral
  • 2019-nCoV Vaccine mRNA-1273
  • Antibodies, Neutralizing
  • COVID-19 Vaccines
  • Immunoglobulin G
  • Spike Glycoprotein, Coronavirus

Supplementary concepts

  • SARS-CoV-2 variants