A measles outbreak has emerged in the United States, primarily affecting rural areas in West Texas. More than 150 cases have been confirmed, marking the largest outbreak in recent years. Health officials have also reported cases in New Mexico, Alaska, California, Georgia, Kentucky, New Jersey, New York, Pennsylvania, and Rhode Island. The Centers for Disease Control and Prevention (CDC) defines an outbreak as three or more related cases, with three clusters meeting this classification in 2025. Measles spreads through the air and remains one of the most contagious viruses. Studies indicate that an infected person can transmit the disease to about 15 others in unvaccinated groups. Experts attribute the resurgence to declining vaccination rates, especially in areas with inadequate immunization coverage.

Health authorities are implementing urgent measures to control the outbreak. The CDC has sent specialists to Texas to assist in containment efforts. Medical experts confirm that the measles, mumps, and rubella (MMR) vaccine remains the most effective prevention. Since the 1960s, the vaccine has significantly reduced measles cases worldwide. The CDC recommends two doses, with the first at 12–15 months and the second at 4–6 years. Studies emphasize that a 95% vaccination rate is necessary to prevent outbreaks. However, immunization rates have declined, partly due to the COVID-19 pandemic. Epidemiologists stress that reinforcing vaccination programs is essential to reducing transmission and protecting communities.