The number of measles cases in the United States has surpassed 5,000 this year, reaching its highest level in 35 years, as outbreaks continue to spread across the country and health officials report additional deaths.

The US Centers for Disease Control and Prevention (CDC) reported 5,182 confirmed cases as of November 5, marking an increase of 330 from the previous weekly update.

Cases have been reported in 47 jurisdictions, including 45 states and Washington, D.C., while 18 infections have been identified among international visitors to the country.

The 2026 total is already more than double the 2,289 cases recorded throughout 2025 and represents the highest annual figure since 1991.

At least eight measles-associated deaths have been reported by state health authorities this year. Six occurred in Pennsylvania, while New York and Wisconsin each reported one death.

Three of the deaths were announced by state officials this week. New York health authorities reported the state's first known measles-associated death in more than 30 years, involving a child from upstate New York.

Pennsylvania officials also confirmed the death of an unvaccinated resident of Jefferson County, while Wisconsin health authorities reported that an infant had died from measles, marking the state's first such death since 1990.

The CDC's national figures currently list four confirmed measles-associated deaths, noting that the number is subject to change as further information and reviews become available.

According to CDC data, approximately 96% of infections this year have involved people who were either unvaccinated or whose vaccination status was unknown.

The agency also reported that 4,993 cases, or 96% of the national total, were associated with outbreaks. A total of 43 outbreaks have been reported so far in 2026.

Nationwide, 562 people have been hospitalized with measles this year, accounting for approximately 11% of confirmed cases.

Adults aged 20 and older account for the largest number of infections, with 2,132 cases. People aged 5 to 19 account for 2,104 cases, while 908 infections have been reported among children under five.

The latest figures highlight the resurgence of a highly contagious disease that was declared eliminated in the United States in 2000 following decades of widespread vaccination.

The measles, mumps and rubella (MMR) vaccine remains the primary means of preventing infection. The CDC says vaccination coverage of at least 95% within communities is generally needed to maintain protection against widespread transmission.

Measles can cause fever, cough, a runny nose, red eyes and a characteristic rash. Serious complications include pneumonia and encephalitis, or inflammation of the brain, and the disease can be fatal, particularly among young children.

Health authorities continue to urge vaccination and warn that declining immunisation coverage can leave communities vulnerable to outbreaks. (ILKHA)