Story perspectives
Colorado Whooping Cough Cases Surge 600%, Vaccinated Kids Affected
6/1/2026
1 of 1
Story summary
- Colorado reports a sharp whooping cough resurgence with over 930 cases in 2024-2025, mostly under 18.
- School DTaP and Tdap vaccination rates fell 2.9% and 3.3% since 2019-2020.
- Seventy-three percent of 2025 cases occurred in vaccinated people, showing waning immunity.
- Pediatrician Dr. Stephanie Harris notes a 600% local case rise since 2006 and urges boosters.
