Highly contagious respiratory syncytial virus is more common than health experts first believed, affecting 2.1 million children under age 5 each year, a study found. Researchers said data from November through April over a four-year period showed RSV accounted for 20% of hospitalizations, 18% of ER visits and 15% of provider visits for young children in three U.S. counties. The study team suggested more research should be focused on finding a vaccine for the virus.

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