DOI: 10.1093/ofid/ofae144 ISSN: 2328-8957

Concurrent administration of COVID-19 and influenza vaccines enhances Spike-specific antibody responses

Susanna E Barouch, Taras M Chicz, Ross Blanc, Domenic R Barbati, Lily J Parker, Xin Tong, Wenjun Li, Ryan P McNamara
  • Infectious Diseases
  • Oncology



The bivalent COVID-19 mRNA boosters became available in fall 2022 and were recommended alongside the seasonal influenza vaccine. However, the immunogenicity of concurrent versus separate administration of these vaccines remains unclear.


Here, we analyzed antibody responses in healthcare workers who received the bivalent COVID-19 booster and the influenza vaccine on the same day or on different days through systems serology. Antibody binding and functional responses were characterized at peak responses, and after 6 months following vaccination.


IgG1 and neutralization responses to SARS-CoV-2 XBB.1.5 were higher at peak and after 6 months following concurrent administration compared with separate administration of the COVID-19 and influenza vaccines. While similar results were not observed for influenza responses, no interference was noted with concurrent administration.


These data suggest that concurrent administration of these vaccines may yield higher and more durable SARS-CoV-2 neutralizing antibody responses while maintaining responses against influenza.

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