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The Centers for Disease Control and Prevention (CDC) has issued a "Worldwide Caution" following a significant spike in measles cases within the United States. As of March 5, 2026, there have been 1,136 confirmed cases reported across the country. This represents a substantial portion of the total cases seen in 2025, raising fears of a major outbreak.
Data shows that the majority of those infected (92%) are either unvaccinated or have an unknown vaccination status. Children under the age of five account for about 24% of the cases, with the highest concentration among school-aged children (5-19 years). Hospitalization rates remain a concern, particularly for adults and the very young.
Public health officials are urging parents to ensure their children are up to date on the MMR (measles, mumps, and rubella) vaccine. The CDC has provided toolkits and resources for communities currently experiencing outbreaks to help curb the spread. The situation is being exacerbated by a growing "vaccine hesitancy" movement nationwide.
The outbreak has led to some logistical challenges, including the cancellation of school events in affected areas. In some states, health departments are considering mandatory quarantine measures for those exposed to the virus. Federal health officials are monitoring the situation closely as spring travel begins to ramp up.
The CDC’s report also highlights a "Worldwide Caution" for travelers, as measles cases are also on the rise internationally. Americans traveling abroad are advised to check their immunization records and take necessary precautions to avoid bringing the virus back to the U.S.
SUMMARY
CDC confirms 1,136 measles cases in the U.S. since the start of 2026.
92% of cases occur in individuals who are unvaccinated or have unknown status.
Children and young adults are the most affected demographics in the current surge.
Health officials warn of a "national outbreak" if vaccination rates do not improve.
CDC issues a "Worldwide Caution" for travelers due to global increases in measles.
HISTORY
The U.S. had previously eliminated measles in 2000, but sporadic outbreaks have occurred due to declining vaccination rates in certain communities. The year 2025 saw a total of 2,281 cases, the highest in decades.
May 2025: Major measles outbreak linked to a theme park in the Midwest.
October 2025: Public health departments report a 5% drop in MMR vaccination rates.
January 2026: The first 100 cases of the new year are reported in three states.
February 2026: CDC warns of "community spread" in urban centers.
March 5, 2026: Confirmed case count surpasses 1,100 for the year.