A rise in cases of a contagious lung infection across the United States is causing alarm, especially for parents of young children. Walking pneumonia usually sickens school-aged children and teens, but this year, toddlers are being hit the hardest. Ali Rogin speaks with Dr. Donald Dumford, infectious disease specialist at Cleveland Clinic, to learn more. PBS News is supported by - https://www.pbs.org/newshour/about/funders
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