Same-day administration of updated COVID-19 and seasonal influenza vaccines did not increase the risk of serious or clinically significant adverse events compared to influenza vaccination alone, based on a study involving over 2.5 million adults in the U.S. Department of Veterans Affairs health care system.
Background
The coadministration of COVID-19 and influenza vaccines is a relevant topic as it may enhance vaccination rates and convenience for patients. Understanding the safety profile of simultaneous vaccination is crucial, especially for older adults who are at higher risk for severe outcomes from both infections.
Data Highlights
No significant increase in adverse events was observed with same-day vaccination.
Key Findings
Over 2.5 million adults were evaluated for vaccine safety.
More than 700,000 individuals received both vaccines on the same day.
No statistically significant increase in 90-day risks of serious or clinically significant adverse events was found.
Results were consistent across three updated COVID-19 vaccine formulation periods.
Nominal differences in syncope and tinnitus were not statistically significant after adjustment.
Clinical Implications
The study found no statistically significant increase in 90-day risks of serious or clinically significant adverse events with same-day vaccination.
Conclusion
Same-day coadministration of COVID-19 and influenza vaccines did not show an increased risk for adverse events, providing evidence relevant to vaccination strategies.
