Overview

• A second measles case in Denver, linked to a household contact, was contained through quarantine with no risk of public exposure.
• Illinois confirmed its first measles case of 2025, with health officials identifying exposure locations and assessing risks, which remain low statewide.
• The ongoing outbreak in Texas and New Mexico accounts for over 680 of the 800 confirmed U.S. cases this year, along with three deaths.
• Colorado has seen significant increases in MMR vaccinations, with a 45% rise among infants and a 126% rise among adults in 2025.
• Public health agencies emphasize vaccination, contact tracing, and proactive reporting as critical tools to prevent broader outbreaks.