Surviving one bout of Lyme disease does not make you immune. Patients are often surprised — and dismayed — to learn that a new tick bite can start the whole process over again. Understanding the difference between reinfection and relapse also clears up one of the most confusing situations in Lyme care.
Medically reviewed by Elyssa A. Blissenbach, MD, board-certified internal medicine physician.
Yes — Reinfection Is Real
Infection with Borrelia burgdorferi does not produce lasting protective immunity. People who live, work, or play in tick habitat can be infected in different seasons or years, and documented reinfections are well described in the medical literature — sometimes with a new expanding rash at a completely different site from the first.
Reinfection or Relapse? How Physicians Tell
A new erythema migrans rash at a new location during tick season, after a completed course of treatment, generally points to a new infection. Recurring joint or neurological symptoms without a new rash or new exposure are more complicated: possibilities include incomplete treatment of the original infection, post-treatment Lyme disease syndrome, or an entirely different condition. Antibody tests are not useful for separating these — antibodies persist for years after a resolved infection, so a positive test cannot distinguish old from new.
Protecting Yourself the Second Time
Prevention is identical, and worth taking more seriously the second time: permethrin-treated clothing, EPA-registered repellents, daily tick checks, and prompt, correct removal of any attached tick. If you are bitten again, act within the first 72 hours — the preventive window matters.
Frequently Asked Questions
Is a second Lyme infection worse than the first?
Not inherently. Severity depends on how quickly the new infection is recognized and treated, not on the fact that it is a repeat.
My Lyme test is still positive years later — am I still infected?
Not necessarily. Antibody tests commonly remain positive long after successful treatment. Symptoms and history, not serology alone, drive the assessment.
Does Lyme disease ever come back on its own?
True relapse after a full, appropriate course of antibiotics appears uncommon. Recurring symptoms deserve evaluation for reinfection, PTLDS, or another diagnosis.
Northeast Florida Internal Medicine treats Lyme disease and other tick-borne illnesses in person in Jacksonville and via telemedicine for patients in Florida, Georgia, Alabama, South Carolina, North Carolina, and Virginia. Contact us to schedule a consultation.
This article is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified physician with any questions about a medical condition.