Borrelia burgdorferi
Coverage of Borrelia burgdorferi in the Nexus archive.
- Warmer temps bring soaring tick populations – here’s how to stay safe from Lyme disease
Warmer weather is increasing tick populations, leading to higher Lyme disease risks. The CDC reported record tick-bite emergency room visits in 2026, with experts estimating 500,000 U.S. cases annually. Lyme disease, caused by Borrelia bacteria via deer tick bites, is most prevalent in the Northeast and Upper Midwest.
- Rare type of Lyme disease found for the first time in New York
A rare type of Lyme disease caused by Borrelia mayonii was detected for the first time in upstate New York, specifically in Herkimer County. Previously found only in Minnesota and Wisconsin, the bacteria was identified in an adult who had not recently traveled, with local ticks testing positive but no further spread detected. The case highlights differences in symptoms compared to the more common Borrelia burgdorferi strain.