COVID-19 vs. Flu vs. RSV: How to tell the difference between respiratory infections

🩺 Ask Doctor Hansen:
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The flu, COVID-19, and respiratory syncytial virus (RSV) are all highly contagious respiratory infections caused by viruses: The flu by influenza virus, COVID-19 by SARS-CoV-2 virus, and RSV by respiratory syncytial virus. It is possible for a person to be infected with multiple viruses at the same time. Suffering from flu RSV or COVID-19?
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