Aurora City Council members gave preliminary approval Thursday to requiring such notification within 48 hours of discovery.
Sentinel Colorado reports the proposal comes after a spate of chickenpox and mumps outbreaks at a privately owned and operated federal immigration detention center in Aurora.
The facility had 15 reported cases of mumps and nine of chicken pox from the beginning of 2019 through mid-March.
Facility officials implemented a vaccination program after the outbreaks.
The reporting proposal would apply to three other facilities if approved by the full City Council.