Measles Outbreak Expands Along Arizona-Utah Border

A significant outbreak of measles has been reported along the border regions of Arizona and Utah, marking one of the most substantial surges in recent decades. Local health authorities have confirmed dozens of cases, predominantly affecting unvaccinated children in the area. In southwest Utah, there have been 27 confirmed cases, with nearly all victims being unvaccinated school-age children. Similarly, Mohave County in Arizona has reported 42 cases, including a child who required hospitalization. Experts highlight that these numbers represent the highest case count since the 1990s.

The surge is primarily attributed to low vaccination coverage in the communities. In Washington County, Utah, only about 79% of kindergartners are vaccinated against measles, falling significantly below the 95% threshold needed for herd immunity. In Mohave County, vaccination rates among kindergartners are alarmingly low, with only 7.7% vaccinated in the previous school year.

Health officials, including David Heaton of the Southwest Utah Public Health Department, emphasize that this is the first measles case most have seen in nearly two decades, underscoring the impact of declining vaccination rates. The contagious nature of measles, combined with insufficient immunization, creates a perfect environment for outbreaks. Symptoms of measles include fever, cough, runny nose, and rash, but the disease can cause severe complications like pneumonia, neurological damage, and even death.

The Centers for Disease Control and Prevention (CDC) reports 1,514 measles cases and 40 outbreaks across the U.S. so far in 2025, making it the worst year in over 30 years for measles activity. Public health officials urge vaccination to prevent further spread, emphasizing that vaccines not only protect individuals but also help maintain community-wide immunity. The CDC's acting director, Jim O'Neil, advocates for parental vaccination to safeguard both children and the wider community.

Overall, experts warn that low vaccination rates increase the risk of widespread outbreaks, highlighting the importance of immunizations in controlling highly contagious diseases like measles.