A study of 2.5 million U.S. veterans found that receiving COVID-19 and influenza vaccines on the same day did not increase the risk
One trip to the pharmacy may be all you need to help protect yourself from COVID-19 and the flu this fall.
A new study finds getting both vaccines at the same visit is no riskier than getting a flu shot alone.
Researchers analyzed health records from 2.5 million U.S. veterans, comparing more than 700,000 adults who received both vaccines on the same day with 1.8 million who received only a flu shot.
The researchers tracked participants for 90 days after vaccination, monitoring 46 potential adverse events, ranging from less serious to life-threatening.
The results showed same-day vaccination did not increase the risk of serious side effects, including heart and blood clotting problems, neurological disorders, and immune-related conditions.
The study was conducted across multiple updated COVID-19 vaccine formulations from the fall of 2022 to the summer of 2025.
The authors say the findings support the short-term safety of receiving both vaccines during the same visit and could help guide future vaccine recommendations.
Source: Annals of Internal Medicine
Author Affiliations: VA St. Louis Health Care System, Washington University School of Medicine
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