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Children Given Flu Shot Less Likely to Have Symptomatic COVID-19

Odds also lower for having severe disease for patients vaccinated for influenza, pneumococcal disease

Children Given Flu Shot Less Likely to Have Symptomatic COVID-19

WEDNESDAY, Feb. 24, 2021 (HealthDay News) -- Children who have received an influenza vaccine are less likely to have symptomatic COVID-19 or severe disease, according to a study recently published in Cureus.

Anjali Patwardhan, M.D., and Adrienne Ohler, Ph.D., from the University of Missouri in Columbia, examined the effect of influenza and pneumococcal vaccines on the disease course among severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) patients aged 20 years and younger who visited Arkansas Children's Hospital System between Feb. 1 and Aug. 30, 2020.

The researchers found that viral interference may have played a role in the flu and COVID-19 twindemic. Comparing SARS-CoV-2-positive patients who had been vaccinated versus those who had not been vaccinated for influenza showed that patients who were vaccinated had lower odds of having symptomatic diseases (odds ratio [OR], 0.714). Patients who received the pneumococcal vaccine also had lower odds of having symptomatic disease than those who were unvaccinated (OR, 0.482). Compared with patients who were not vaccinated, patients who were vaccinated for influenza had lower odds of having respiratory symptoms (OR, 0.678). Patients vaccinated for influenza and pneumonia had lower odds of severe disease than those not vaccinated (ORs, 0.672 and 0.412, respectively).

"It is known that the growth of one virus can be inhibited by a previous viral infection," Patwardhan said in a statement. "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."

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