10 facts to know about Kawasaki Disease: Causes, sympoms, treatment, link to coronavirus? Fifteen kids in New York City (U.S) have been hospitalized with symptoms consistent with Kawasaki disease, a rare condition that causes swelling in the arteries. Experts think the rash of cases, which have been reported in children ages 2 to 15, may be linked to COVID-19. In the United Kingdom, cases of Kawasaki disease have been confirmed in children with coronavirus, reports The Cut, Forbes, NYT.