Blacklegged ticks carrying Lyme disease have expanded into the mountains of western North Carolina, far south of the disease’s traditional Northeast and Upper Midwest range, according to an Aug. 13 CDC report.
Researchers surveilling 22 residential properties in Biltmore Forest, N.C., near Asheville, collected 373 ticks from November 2024 through August 2025, according to the CDC’s “Morbidity and Mortality Weekly Report.” Blacklegged ticks — the primary Lyme vector — made up 287, or 76.9%, of them.
Nearly 40% of the adult blacklegged ticks, or 19 of 48 specimens, tested positive for Borrelia burgdorferi, the bacterium that causes Lyme disease. Three of seven nymphs also carried it.
Nineteen residents across 17 households reported at least one tick-borne illness while living in the town, the CDC report said. Lyme disease was the most common, with 17 cases, followed by two cases of babesiosis and one of ehrlichiosis.
The findings point to an emerging clinical blind spot. Many clinicians across the South have little experience diagnosing or managing tick-borne disease, the report’s authors said, and may not consider Lyme in patients with no travel history to endemic regions.
The report lands amid a broader surge in tick activity. Tick-bite-related emergency department visits hit a nine-year high in April, when 104 of every 100,000 ED visits were tied to tick bites — up from an average of 63 per 100,000 in the same month from 2018 to 2025, according to CDC data.
At the Becker's 11th Annual IT + Revenue Cycle Conference: The Future of AI & Digital Health, taking place September 14–17 in Chicago, healthcare executives and digital leaders from across the country will come together to explore how AI, interoperability, cybersecurity, and revenue cycle innovation are transforming care delivery, strengthening financial performance, and driving the next era of digital health. Apply for complimentary registration now.
