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The study found most reactions were reported as mild or moderate and were recorded most often on the day after vaccination. When compared to the administration to a COVID-19 mRNA booster alone, the authors report an 8–11% greater chance of reactions.īoth the Pfizer and Moderna COVID-19 vaccines were included in the study. The researchers found the simultaneous administration of an mRNA COVD-19 booster along with an influenza vaccine is associated with a ‘statistically significant’ increase in systemic reactions in the seven days following vaccination.

Participants submitted data voluntarily through v-safe app, a smartphone-based monitoring system that was set up by the CDC. The research was based on self-reported data from 981,099 people in the US aged 12 years and over, collected from 22 September 2021 until. The study, supported by the US Centers for Disease Control and Prevention (CDC), was designed to assess the safety of administering COVID-19 booster shots and influenza vaccines at the same time.Īuthors say the safety profile of co-administering the vaccines separately ‘has not been well described’. That is the finding of a new peer-reviewed study published this month on the JAMA (Journal of the American Medical Association) Network.

There is slightly higher chance of an adverse response when COVID-19 booster vaccines are administered at the same time as influenza vaccination – but those reactions are mostly mild or moderate. Official advice allows the co-administering of COVID-19 and flu vaccines in Australia. A peer-reviewed article looking at the co-administration of COVID booster and flu vaccines in the US reports that most reactions tend to be mild.