What's behind worrying respiratory syncytial virus surge in US children's hospitals?

Children's hospitals in parts of the country are seeing a distressing surge in RSV, a common respiratory illness that can cause severe breathing problems for babies. Cases fell dramatically two years ago as the pandemic shut down schools, day cares and businesses. [AP Photo]

Children's hospitals in parts of the U.S. are seeing a surge in a common respiratory illness that can cause severe breathing problems for babies.