The United States is experiencing a significant surge in measles cases, with the CDC reporting 607 cases nationwide in 2025 - more than double the number recorded in 2024 [1]. The outbreak has affected multiple states, with Texas bearing the brunt at 505 confirmed cases.

In Ohio, health officials confirmed 20 measles cases as of Thursday, April 10, with 11 cases in Ashtabula County, seven in Knox County, and single cases in Allen and Holmes counties [1]. The Knox County outbreak has actually affected 14 people total, though seven are non-residents.

The situation in Texas remains particularly severe, with 24 new cases reported since Friday, bringing the state's total to 505 cases across 21 counties. Two unvaccinated children, ages 6 and 8, have died from measles-related complications [1]. Gaines County, with a population of 22,892, accounts for 65% of Texas cases, primarily affecting an undervaccinated Mennonite community.

Other states reporting active outbreaks include:

New Mexico: 56 cases with one adult deathKansas: 32 cases across eight countiesOklahoma: 8 confirmed and 2 probable casesIndiana: 6 cases in Allen County

The CDC defines an outbreak as three or more related cases. The agency has identified six distinct outbreak clusters in 2025 [1]. Health experts warn that the spread could continue for a year, particularly in communities with low vaccination rates.

Dr. Scott Weaver of the Global Virus Network recommends that people in outbreak areas who received their vaccines many years ago may want to consider getting a booster shot, particularly if they're at high risk of exposure [1].