What Is Lyme Disease?
Lyme disease is a bacterial infection caused by the Borrelia species, most commonly Borrelia burgdorferi in the U.S. and B. mayonii, and B. afzelii or B. garinii in Europe and Asia. It spreads to humans through the bite of infected black‑legged (deer) ticks
Early Localized Stage (3–30 Days Post‑Bite)
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Erythema migrans (EM) rash appears in about 70–80% of cases: expanding red or bluish oval, sometimes forming a bull’s-eye; usually warm but not painful or itchy.
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Flu-like symptoms include fever, chills, fatigue, headache, muscle/joint pain, swollen lymph nodes.
Early Disseminated Stage (3–10 Weeks Post‑Bite)
If untreated, infection spreads:
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Multiple EM lesions may appear across the body
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Neurological signs: facial paralysis (Bell’s palsy), numbness, nerve pain
Cardiac involvement: heart palpitations, blockages, dizziness
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Persistent fatigue and headaches
Late Disseminated Stage (Months to Years Later)
Advanced infection can cause:
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Severe arthritis—often in knees or large joints
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Neuropathy, tingling or numbness in hands/feet
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Chronic headaches, cognitive issues like memory loss
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Mood disturbances, sleep problems, possible brain or cardiac inflammation
Key Facts You Should Know
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Many people don't recall being bitten; EM rash often goes unnoticed in hidden areas.
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Risk rises after tick attachment exceeding ~36 hours.
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Lyme tends to mimic other conditions since symptoms can be vague or atypical.
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In the U.S., over 400,000 new cases occur annually.
Diagnosis & Treatment
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Diagnosis is based on medical history, exam, and blood tests (though early results can be false‑negative).
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Antibiotics such as doxycycline or amoxicillin for 10–14 days are effective, especially in early stages.
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Persistent symptoms post-treatment may indicate post‑treatment Lyme disease syndrome (PTLDS), for which extended antibiotics are not proven helpful.
Prevention Tips
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Wear light-colored, long clothing, use tick repellents (DEET or permethrin-treated)
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After being outdoors: shower, thoroughly check skin folds (groin, armpits, scalp)
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Prompt removal of ticks with fine-tipped tweezers, grasping close to skin, pulling straight out cleanly
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| 2 | bull’s eye rash |
| 3 | erythema migrans |
| 4 | tick bite signs |
| 5 | Lyme disease stages |
| 6 | borrelia burgdorferi |
| 7 | Bell’s palsy Lyme |
| 8 | chronic Lyme symptoms |
| 9 | Lyme prevention methods |
| 10 | post‑treatment Lyme syndrome |
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