HOUSTON – The Houston Independent School District released a statement on Monday night saying that several individuals associated with the district were placed on quarantine. The release states, “All self-quarantine individuals recently returned from a country on the CDC travel warning list or are closely related to someone who did. Schools will be identified specifically if cases are positively confirmed.”District officials haven’t stated if the individuals are students or staff or which schools are impacted. HISD said it is working with the city and county health departments, as well as the CDC. No confirmed cases have been reported at HISD.