South Carolina health officials announced nine new measles cases today in an Upstate outbreak, bringing the outbreak total to 153 and the statewide total to 156 for the year.

“Five of the new cases were known household exposures, two resulted from a previously reported school exposure, the source of one is unknown and one is still being investigated,” officials said in a press release. “There are currently 249 people in quarantine and seven in isolation.”

Since October, the outbreak in the Upstate region has been growing, with cases seeded in several elementary schools with large unvaccinated student populations.

Of all the cases, 145 have been in unvaccinated people, three partially vaccinated with one of the recommended two-dose MMR sequence, one vaccinated, and four with unknown vaccine status.

Utah County reports more cases 

Utah now has 142 measles cases, including 101 in the Southwest Utah health region. Utah County now has 16 cases. The six new cases reported yesterday were in Utah County among children under age 18. State epidemiologists have said this is the highest measles activity seen in more than 30 years.

The United States likely surpassed 2,000 measles cases this week, according to a tracker from Johns Hopkins University. Though the Centers for Disease Control and Prevention has yet to update case counts this week, Johns Hopkins estimates 2,010 cases since January 1, 2025. 

Gaines, Texas, had the highest case count, with 414 measles cases reported last spring. Mohave, Arizona, has 186 cases.