South Carolina Ends Worst Measles Outbreak in 35 Years as Florida Cases Climb to 134

South Carolina declared an end Monday to the worst measles outbreak in the United States in more than 35 years, after 997 people were sickened, at least 21 hospitalized, and $2.1 million spent on the public health response. Health officials warn the national picture remains dangerous, and Florida is not watching from the sidelines.

The state passed the required threshold of 42 consecutive days without a new outbreak-related case on Sunday, state health officials said. The outbreak, centered in northwestern Spartanburg County, began in October and at its peak produced more than 650 confirmed cases in January alone — eclipsing the 2025 West Texas outbreak that killed two school-age children.

Florida has confirmed 134 measles cases so far this year, according to the Centers for Disease Control and Prevention. Nationally, the U.S. has logged 1,792 cases in 2026 — nearly 80 percent of all cases recorded in the record-breaking full year of 2025 — across 22 separate outbreaks. That trajectory matters directly for Treasure Coast families: Martin, St. Lucie, and Indian River counties include substantial populations of young children and immunocompromised residents for whom measles can cause pneumonia, brain swelling, or death. Florida's declining childhood vaccination rates in recent years, driven by rising parental opt-outs from school-required shots, leave pockets of those communities exposed. [NEEDS VERIFICATION — county-level MMR vaccination rates for Martin, St. Lucie, Indian River]

"We are certainly not letting our guard down, and I don't think that South Carolinians who are still vulnerable to the virus, that don't have immunity, should let their guard down," Dr. Brannon Traxler, chief medical officer for the South Carolina Department of Public Health, said.

South Carolina's outbreak ended through a combination of disease-driven immunity and a late surge in vaccinations, Traxler said. Public health officials administered nearly 82,000 measles vaccines from October through March, a 30 percent increase over the same period a year prior. Public health workers also sent 2,300 quarantine letters and quarantined 874 students across seven school districts.

The MMR vaccine is safe and 97 percent effective after two doses, CDC data show.

The greatest current concern among federal health officials is an outbreak spanning Utah and Mohave County, Arizona, where 607 and 282 cases respectively have been confirmed since August. Genetic analysis suggests the true case count may be higher than reported, according to research presented at a CDC conference last week.

In November, international health officials will determine whether the United States has lost the measles elimination status it has held since 2000. Treasure Coast residents seeking vaccination information can contact the Florida Department of Health offices in Martin, St. Lucie, or Indian River County.

This article was generated with AI assistance using publicly available information. It was reviewed and approved by a human editor before publication. TC Sentinel uses AI writing tools in accordance with FTC guidelines.