Health authorities in Arizona have identified four connected measles cases in Navajo County, marking the first outbreak in the state this year.

Nationwide, the U.S. reported 122 new measles cases last week, with only four occurring in Texas. Meanwhile, outbreaks in Michigan and Pennsylvania have officially ended.

As of Friday, the CDC reported a total of 1,168 confirmed measles cases in the U.S. Texas, which previously experienced the country's most severe outbreak earlier in the year, has shifted to weekly updates for case counts, indicating a slowdown in new infections.

Across North America, three significant outbreaks remain. Ontario, Canada has seen the largest, with 2,009 cases since mid-October, including the death of an infant with congenital measles and other health issues. Alberta reported 761 cases by Thursday, and Chihuahua, Mexico has confirmed 1,940 cases and four deaths.

Other U.S. states currently experiencing outbreaks—defined by the CDC as three or more connected cases—include Colorado, Illinois, Kansas, Montana, New Mexico, North Dakota, Ohio, and Oklahoma.

This year, measles has claimed the lives of two school-aged children in West Texas and an adult in New Mexico. None were vaccinated.

Measles, a highly contagious airborne virus, spreads through coughing, sneezing, or breathing. Vaccination can prevent infection, and the disease was considered eliminated from the U.S. in 2000.

Texas
Texas has documented 744 measles cases across 35 counties, mostly in West Texas. So far, 96 people have been hospitalized. Currently, less than 1% of cases—fewer than 10—are believed to be contagious. Over half of the state's cases are in Gaines County, primarily within an undervaccinated Mennonite community that has reported 411 cases since January. Two unvaccinated children, aged 6 and 8, died in February and April.

New Mexico
New Mexico remains at 81 cases, with seven hospitalizations. Most are in Lea County, with smaller numbers in several others. An unvaccinated adult died from measles complications in March after not seeking medical attention.

Oklahoma
Oklahoma now has 16 confirmed and three probable measles cases. The state has not disclosed the counties affected.

Arizona
Arizona has reported four measles cases in Navajo County, all unvaccinated and linked to recent international travel, according to the local health department.

Colorado
Colorado has had 14 measles cases in 2025, including eight linked to a single outbreak tied to a Turkish Airlines flight arriving in Denver in May. Cases have appeared in Arapahoe, El Paso, and Denver counties, as well as in an out-of-state resident. Other reported cases occurred in Archuleta and Pueblo counties.

Illinois
Illinois confirmed an eight-case outbreak in its southern region, up from four in early May. Two unrelated cases were also reported in Cook County.

Kansas
Kansas has reported 71 measles cases in 11 southwestern counties, with three hospitalizations. The majority of cases are in Gray County, and all but two are connected.

Montana
Montana, which hadn’t seen measles in 35 years, now has 17 cases—10 in Gallatin County, two each in Flathead and Yellowstone, and three in Hill County. Neighboring North Dakota and several Canadian provinces also have ongoing outbreaks.

North Dakota
North Dakota has recorded 34 cases—its first since 2011—with two hospitalizations. All patients were unvaccinated. Williams, Grand Forks, Cass, and Burke counties are among those affected.

Ohio
Ohio has held steady at 34 measles cases and one hospitalization for three weeks. Two outbreaks are active: 16 cases in Ashtabula County and 20 in Knox County (including non-residents). Isolated cases were also reported in several other counties.

Tennessee
Tennessee reported six cases since early May, but no new infections in the past six weeks, indicating the outbreak may be over.

Additional States
Measles cases have also been identified in: Alaska, Arkansas, California, Florida, Georgia, Hawaii, Indiana, Iowa, Kentucky, Louisiana, Maryland, Michigan, Minnesota, Missouri, Nebraska, New Jersey, New York, Pennsylvania, Rhode Island, South Dakota, Vermont, Virginia, and Washington. Previous outbreaks in Indiana, Michigan, and Pennsylvania are now considered over.

Most U.S. measles outbreaks originate from unvaccinated individuals who were infected abroad. In May, the CDC noted that imported cases more than doubled compared to last year.

In 2019, the U.S. reported 1,274 measles cases—nearly losing its measles-free status.

MMR Vaccine Guidance
The most effective measles prevention is the MMR (measles, mumps, and rubella) vaccine. The CDC recommends the first dose for children between 12 and 15 months and a second between ages 4 and 6. Adults concerned about immunity can safely receive another dose. People vaccinated before 1968 with a killed-virus vaccine should be reimmunized. Those born before 1957 are presumed immune due to widespread childhood exposure.

Communities with at least 95% vaccination rates benefit from herd immunity. However, since the pandemic, vaccination rates have dropped, and more parents are opting out of immunizations due to personal or religious beliefs.

Measles Symptoms and Treatment
Measles typically starts with respiratory symptoms like fever, cough, runny nose, and red eyes, followed by a red rash that begins on the face and spreads downward. Fever can exceed 104°F. While most children recover, complications such as pneumonia, blindness, encephalitis, or death can occur.

There is no specific cure for measles. Treatment focuses on relieving symptoms, preventing complications, and supporting recovery.