Some children who had COVID developed a severe inflammatory response that could put them in the ICU. Scientists have learned why it happens.

MIS-C, a post COVID illness that has affected more than 2,000 U.S. children, causes inflammation of the heart, lungs, brain and other organs. One D.C. pediatric ICU is nearly full of such patients.

For children under the age of 11, the total percent positive has gone from less that 1% in May to more than 3% in July, according to the Georgia Department of Public Health.

After contracting coronavirus, almost 200 kids in the U.S. developed a new inflammatory syndrome. Most recovered, but pediatric researchers have started a study to watch for long-term effects.