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Published on: 7/15/2026
Lyme disease is transmitted by the black-legged tick, commonly known as the deer tick (Ixodes scapularis). Found primarily in the northeastern, mid-Atlantic, and upper midwestern United States, these ticks carry the bacterium Borrelia burgdorferi, which causes Lyme disease when transmitted through a bite. In western states, the closely related western black-legged tick (Ixodes pacificus) is the primary carrier.
If you've been bitten by a tick or are experiencing symptoms like a bullseye rash, fatigue, fever, or joint pain, don't wait to find answers. Early identification is critical, as untreated Lyme disease can lead to serious long-term complications affecting the joints, heart, and nervous system. Take a free, instant, online symptom check to better understand what may be causing your symptoms and get personalized guidance on your next steps.
Reviewed for medical accuracy: 07/15/2026
Lyme disease is primarily transmitted to humans through the bite of infected ticks, specifically the black-legged tick, which is also known as the deer tick. These ticks are commonly found in the northeastern, north-central, and Pacific coastal regions of the United States.
Understanding the role of the black-legged tick in spreading Lyme disease is crucial for prevention and early detection, which can significantly improve outcomes if the disease is contracted. If you're experiencing symptoms after a tick bite or suspect you may have been exposed, take our free symptom checker to evaluate your condition and determine if you should seek medical attention.
(References)
Bush LM, & Vazquez-Pertejo MT. (2018). Tick borne illness-Lyme disease. Disease-a-month : DM, 29402399.
Lo Re V 3rd, Occi JL, & MacGregor RR. (2004). Identifying the vector of Lyme disease. American family physician, 15117014.
Mead P. (2022). Epidemiology of Lyme Disease. Infectious disease clinics of North America, 36116831.
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