COLUMBIA, MO ― Researchers from the University of Missouri School of Medicine have discovered that children who receive a seasonal flu shot are less likely to suffer symptoms from a COVID-19 infection. The finding comes from a review of more than 900 children diagnosed with COVID-19 in 2020.
“It is known that the growth of one virus can be inhibited by a previous viral infection,” said Anjali Patwardhan, MD, professor of pediatric rheumatology and child health. “This phenomenon is called virus interference, and it can occur even when the first virus invader is an inactivated virus, such as the case with the flu vaccine.”
Patwardhan reviewed records from 905 pediatric patients diagnosed with COVID-19 between February and August 2020 to determine each patient’s influenza vaccination history. She discovered the COVID-19 positive children who received the influenza vaccine in the current flu season had lower odds of experiencing symptoms, respiratory problems or severe disease. She also found that children with COVID-19 who received the pneumococcal vaccine also had lower odds of experiencing symptomatic disease.
“Research on the pediatric population is critical because children play a significant role in influencing viral transmission,” Patwardhan said. “Understanding the relationship and co-existence of other viruses alongside COVID-19 and knowing the vaccination status of the pediatric patient may help in deploying the right strategies to get the best outcomes.”
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Patwardhan said it will also be important to explore the connection between vaccinations and COVID-19 symptoms in a larger geographical-multiracial study.
“Based on these findings, we hypothesize that the higher incidence of COVID-19 in minority populations may also reflect their low vaccination rate apart from other health inequalities,” Patwardhan said.
Patwardhan’s co-author is MU School of Medicine colleague Adrienne Ohler, PhD, associate research professor. Their study, “The Flu Vaccination May Have a Protective Effect on The Course of COVID-19 in the Pediatric Population: When Does Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-Cov-2) Meet Influenza,” was recently published in the journal Cureus.
The authors declare they have received no financial support for this study and report no conflicts of interest.
About University of Missouri Health Care and the University of Missouri School of Medicine
MU Health Care and the MU School of Medicine form an academic health system dedicated to patient care, research and education. Caring for patients from each of Missouri’s 114 counties, both enterprises focus on advancing care for the simplest and most complex conditions, researching breakthroughs for today’s most prevalent health problems and training the next generation of health care providers. With a combined expertise of nearly 7,000 faculty physicians, researchers, nurses and other health care professionals, the academic health system educates over 2,000 students, residents and fellows each year and serves nearly 240,000 patients. For more information, visit muhealth.org and medicine.missouri.edu.