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Research has found that it is safe for people to receive a flu vaccine at the same time as a COVID-19 vaccine. Reported side effects were mainly mild to moderate, and there were no negative impacts on the immune response produced by either vaccine when both were given on the same day, in opposite arms.
The study was led by researchers at the Bristol Trials Centre, University of Bristol and University Hospitals Bristol and Weston NHS Foundation Trust (UHBW) and supported by the Clinical Research Network (CRN) West of England. It is funded by the National Institute for Health Research (NIHR), with the results due to be published in The Lancet.
Earlier in the pandemic, it was not known whether further booster doses of COVID-19 vaccines would be required to give continued protection, and how giving boosters may fit in with the seasonal flu vaccine program.
The Combining Influenza and COVID-19 Vaccination (ComFluCOV) study looked to establish the safety of co-administering the most widely used COVID-19 and influenza vaccines in the UK and describe the expected side effects and immune responses to the vaccines when they are given together. Two COVID-19 and three influenza vaccines were tested, meaning six combinations in all.
Participants recruited to the study were over the age of 18 and had already received one dose of either the Pfizer/BioNTech or the Oxford/AstraZeneca COVID-19 vaccine and were awaiting their second dose.
A total of 679 volunteers took part in the study across 12 NHS sites in England and Wales, and were randomly allocated into one of two groups:
- A group who received their second dose of the COVID-19 vaccine and the flu vaccine at their first study visit, then a saline injection (placebo) at their second visit
- A group who received their second dose of the COVID-19 vaccine and a saline injection (placebo) at their first visit and then the flu vaccine at their second visit.
- Participants also attended a third study visit to discuss any side effects they experienced following their second appointment and to give a final blood sample.
The most common side effects were pain around the injection site and fatigue. With some combinations there was an increase in the number of people who reported at least one side effect when both COVID-19 and flu vaccine were given together, dexamethasone tablets 4mg india but the reactions were mostly mild or moderate.
The immune responses to both the influenza and COVID-19 vaccine were preserved when given together, and 97 percent of participants said they would be willing to have two vaccines at the same appointment in the future.
Dr. Rajeka Lazarus, consultant in infectious diseases and microbiology at UHBW and Chief Investigator for the ComFluCOV study, said: “By conducting this study we have been able to establish that it is possible to protect people from both COVID-19 and flu at the same appointment.
“This is a really positive step which could mean fewer appointments for those who require both vaccines, reducing the burden on those who have underlying health conditions and would usually be offered the influenza vaccine.
“The results of this study have been presented to the Joint Committee on Vaccination and Immunisation (JCVI) for their consideration and will aid policy makers in planning the future of these important vaccination programs.”
Chris Rogers, Professor of Medical Statistics and Clinical Trials and Director of Bristol Trials Centre at the University of Bristol, said: “We are delighted to have worked with Dr. Lazarus to successfully deliver this important study and would like to thank all the volunteers who took part.
“The quality of the data provided by participants was excellent. It is reassuring that the results suggest that there are no safety concerns when giving the COVID-19 and flu vaccines together”.
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