Doctor: Studies suggest children can transmit coronavirus

Dr. Taylor Heald-Sargent, a pediatric infectious disease expert, joins Lawrence O'Donnell to discuss her study, which found that "children younger than age 5 may host up to 100 times as much of the virus in the upper respiratory tract as adults." Dr. Heald-Sargent says that "we can't assume children are immune and we can't assume that children don't carry the virus."

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