Parents ask us every day the difference between the flu (influenza), RSV (respiratory syncytial virus), or COVID (coronavirus disease 2019). While no method is fool proof, here are some typical differences among these viruses:
The flu, caused by influenza virus, comes on suddenly and makes you feel as if you’ve been hit by a truck.
Flu almost always causes fever of 101°F or higher and some respiratory symptoms such as runny nose, cough, or sore throat (many times, all three). In addition to the usual respiratory symptoms, the flu causes
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