Colorado Health Alert Network (HAN)
The Colorado Health Alert Network (HAN) disseminates public health alerts and prevention guidelines to partners, providers, and key stakeholders. To sign up to receive HAN communications directly to your email, please register or sign in at the Colorado Notification System website.
Most HANs are publicly available on this webpage. HANs that are sent locally and not statewide and HANs that contain sensitive information will not be posted. To receive these HANs, please register at the link above.
HAN classifications
2026 HAN communications
- Jan. 6 - HAN Advisory — Colorado continues to recommend American Academy of Pediatrics 2025 Recommended Child and Adolescent Immunization Schedule
- Jan. 7 - HAN Alert — First reported cases of Trichophyton mentagrophytes type VII identified in Colorado
- Jan. 21 - HAN Advisory — New World Screwworm: Outbreak Moves into Northern Mexico
- HAN Alert - Measles case identified in Pueblo County, Colorado (March 31, 2025)
- HAN Update - Additional potential exposure location to previously reported measles case identified (April 2, 2025)
- HAN Alert - Measles case identified in Denver County (April 7, 2025)
- HAN Alert - Measles case identified in Archuleta County (April 8, 2025)
- HAN Alert - Measles cases traveled through Colorado resulting in exposures in Pueblo May 9-10 and Denver on May 13-14, 2025 (May 23, 2025)
- HAN Alert - Measles case identified in unvaccinated child after travel (May 28, 2025)
- HAN Alert - Update: additional measles case and exposures (May 30, 2025)
- HAN Alert - Additional measles cases in Arapahoe and El Paso Counties (June 2, 2025)
- HAN Alert - Additional measles case and exposures in Denver County (June 4, 2025)
- HAN Update - Correction: Additional measles case in Denver with exposures in Arapahoe, Denver, and Weld Counties (June 4, 2025)
- HAN Alert - Two Additional Measles Cases Identified along the Front Range (June 10, 2025)
- HAN Update - Measles case in a Boulder County resident (June 13, 2025)
- HAN Update - Measles case in a visitor to Gunnison County (July 22, 2025)
- HAN Update - Measles in an out-of-state visitor to Chaffee and Gunnison Counties (Aug. 1, 2025)
- HAN Update - Measles case in Denver metropolitan area (Aug. 13, 2025)
- HAN Update - Measles case with no history of travel in Mesa County and additional cases identified in the Denver metropolitan area (Aug. 15, 2025)
- HAN Update - New case of measles in Mesa county and change in measles HAN (Aug. 18, 2025)
- HAN Update - Additional measles cases and wastewater detections (Sept. 3, 2025)
- HAN Update - New case of measles in an out-of-state resident with potential exposures in southern Colorado (Oct. 17, 2025)
- HAN Update - Measles wastewater detections, Routt County (Oct. 22, 2025)
- HAN Update - New case of measles without history of travel in Montezuma County (Dec. 5, 2025)
To report a disease or incident to CDPHE
To report a disease or an outbreak, visit the Report a Disease webpage.
To report another concern or emergency, resources are available at the Report a Concern or Emergency webpage.