The Houston ISD says several of its personnel are under a 14-day self-quarantine for the coronavirus. District officials emphasize that there are no confirmed cases of the virus associated with the district. The HISD says the people involved recently traveled to a country on the CDC's travel warning list, or are relatives of somebody who did. The schools affected will undergo disinfecting and deep cleaning. The HISD didn't name the schools, and said their names would be released only if one or more positive cases of the virus are confirmed.