Though fewer children appear to experience severe illness from the virus than adults, one question that has loomed large, especially for those grappling with decisions about reopening schools and day cares, is exactly what role children play in the transmission of the virus. The CDC report suggests that they can and do spread coronavirus.

The researchers analyzed contact tracing data from 184 people with links to three child care facilities in Salt Lake County from this April to July.

They found at least two children who had no symptoms who not only caught the virus, but passed it to other people, including one mother who was hospitalized. One eight-month-old baby infected both parents.

The researchers say that two of the facility outbreaks began with staff members who had household contacts with the virus.