Resurgence of Measles in the U.S.: A Growing Public Health Concern

Measles has reappeared as a significant public health issue in the United States over the past two years, with no signs of decline. Johns Hopkins University reports 2,295 confirmed measles cases in the U.S. as of July 22, surpassing the 2025 figure of 2,286 cases.

Concentrated Outbreaks

Cases have emerged nationwide, with notable outbreaks in Pennsylvania, South Carolina, Florida, Virginia, Utah, Texas, and Arizona. Texas experienced the largest outbreak in 2025 with 803 reported cases.

CDC Updates

According to the CDC’s latest report on July 17, there were 34 new outbreaks in 2026, down from 48 in 2025. Local outbreaks account for most cases, but some are linked to international visitors. Data shows 93% of measles patients in the past two years were either unvaccinated or had unknown vaccination status. Most cases affect children and young adults aged 5 to 19.

No deaths have been reported in 2026, compared to three in 2025. This resurgence follows more than two decades after health agencies declared the disease eliminated in 2000.

Transmission and Symptoms

Health officials state that measles spreads through direct contact with infected droplets or by air when an infected person breathes, coughs, or sneezes. It remains contagious in the air for up to two hours. Symptoms appear within one to two weeks and include fever, cough, runny nose, and red, watery eyes. A few days later, a rash starts on the face and spreads throughout the body. Individuals are most contagious during the four days before and after the rash onset.

“Measles is so contagious that up to 90% of susceptible individuals exposed to an infected person will contract the disease,” said Dr. Marc Siegel, a senior medical analyst. “We need 95% vaccine coverage for herd immunity.”

Community Protection

For effective herd immunity, a 95% vaccination rate is necessary. Dr. Siegel emphasizes the significance of community protection to safeguard those who cannot receive a live virus vaccine, such as immunocompromised individuals or pregnant women. He warns that the U.S. risks losing its measles elimination status due to sustained local transmission.

The CDC advises all individuals to receive two doses of the MMR vaccine, which is almost 100% effective. Those showing symptoms or suspecting exposure should self-isolate and contact a doctor to prevent further spread.