Kentucky's Measles Outbreak Tops 157 Cases in a 35-Year High, With One County Accounting for 56
Kentucky health officials confirmed 157 measles cases statewide on Wednesday, Oct. 14, spread across 13 counties — the commonwealth's worst measles outbreak in roughly 35 years and its highest yearly total since 1991. By comparison, Kentucky recorded just 13 measles cases in all of 2025. Nine people have been hospitalized and no deaths have been reported.
The largest single cluster sits in Laurel County, in southeastern Kentucky, far from the western counties that have driven most of this year's cases. The county reported seven confirmed cases on Oct. 9; by Oct. 14 the state dashboard listed 56. The Laurel County Health Department said the 56 figure reflects "all cases identified since late August," and that only seven of them have been lab-confirmed so far. The rest are reported cases under joint investigation with the Kentucky Department for Public Health.
Christian County has 45 cases and neighboring Trigg County 25 — both border Tennessee and sit in the Clarksville metropolitan area, so the outbreak zone straddles the state line. Other counties on the state list include Barren (5), Caldwell (5), Carroll (5), Washington (5), Jessamine (4), Lewis (2), Owen (2), Bath (1), Todd (1) and Trimble (1). No cases have been reported in Louisville or the counties around it.
State officials said 155 of the 157 patients were unvaccinated or had an unknown vaccination status. A snapshot from Oct. 10, when the count stood at 104, showed 47 cases among people aged 5 to 17, 45 among adults 18 and older and 12 among children under 5; 102 were unvaccinated or of unknown status, one had received a single MMR dose and one had both recommended doses.
Cabinet for Health and Family Services Secretary Dr. Steven Stack has repeatedly stressed how fast the virus moves where immunity is low. "One person in an unvaccinated community would spread it to about 18 other people," he said. Vaccination, by contrast, protects "97 out of 100 times." Stack added that Kentucky now has "the most measles cases in Kentucky in more than 35 years and the highest nationwide two years in a row."
State data shows kindergartner MMR coverage fell to 86.9 percent in the 2024-2025 school year before recovering to 91.1 percent in 2025-2026 — still below the national figure of roughly 93 percent. Coverage among seventh and eleventh graders has held above 95 percent. Officials attribute the outbreak largely to close-knit, under-vaccinated communities.
Measles spreads through the air when an infected person coughs, sneezes or breathes, and the virus can remain airborne for up to two hours after they leave, according to the state health department. Symptoms begin with high fever, cough, runny nose and red, watery eyes, followed by a rash that starts on the face and spreads down the body; tiny white spots may appear inside the mouth two or three days in. Complications can include pneumonia, dehydration and, rarely, brain swelling. People who were exposed are advised to watch for symptoms for 21 days.
Laurel County officials said their cases are linked to "several large households" with limited interaction with the broader community, and that no public exposures have been tied to the cluster. Tyler Caldwell, co-director of the Laurel County Health Department, said the messaging aims to educate rather than alarm residents. Local schools were on fall break and did not comment.
The Christian County Health Department says both clinic vaccination rates and requests for off-site vaccinations have increased as it works with the state to deliver MMR doses in affected communities. Two doses of MMR are about 97 percent effective against measles and one dose about 93 percent; the series is normally given at 12 to 15 months and again at 4 to 6 years, but people of any age can be vaccinated.
The CDC reported 4,080 confirmed U.S. measles cases as of Oct. 8, with 45 states and Washington, D.C. reporting infections and 18 cases among international visitors. There have been 42 separate measles outbreaks this year, with 96 percent of confirmed cases outbreak-associated. Pennsylvania has passed 1,000 cases with five deaths, and New York Gov. Kathy Hochul declared a disaster emergency on Oct. 5, when the state had 108 cases. Kentucky's surge is a distinct regional outbreak from that northeastern wave.
Stack said contact tracing gets harder as the outbreak spreads: a person in one local outbreak may briefly cross paths with someone from a county "ten over," leaving investigators unsure where exposure happened. "As long as this keeps on sputtering along like this, right now there's no clear way to predict when it might end," he said.