<https://hospitalhealthcare.com/covid-19/flu-vaccination-reduces-infection-risk-and-symptom-burden-of-covid-19/#article>
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<https://hospitalhealthcare.com/covid-19/flu-vaccination-reduces-infection-risk-and-symptom-burden-of-covid-19/#primaryimage>
<https://hospitalhealthcare.com/covid-19/flu-vaccination-reduces-infection-risk-and-symptom-burden-of-covid-19/>