The most recent cases involve an adult and a child, both unvaccinated household members in Tarrant County, health officials said. The source of the infection has not been determined.

There have been 935 confirmed cases of measles across nearly 30 states so far this year, according to the latest update from the CDC on Friday, an increase of 51 over the last week and far surpassing the 285 measles cases reported in the entirety of 2024 (the CDC does not provide data on how many cases are actively infectious).

Sign up for The Brief, The Texas Tribune’s daily newsletter that keeps readers up to speed on the most essential Texas news. The number of cases reported in Texas' historic measles outbreak has risen to 683 cases in 29 counties,