A nurse is assessing a 28-year-old client who presents to the clinic with complaints of fever and headache that have persisted for 2 weeks after gardening in a tick-endemic area. Which assessment finding is most characteristic of the early stage of Lyme disease?
A 35-year-old client presents to the clinic with a complaint of fatigue and joint aches that have persisted for 2 weeks. The client reports spending time hiking in wooded areas of Connecticut last month.
1Severe arthritis in multiple joints
2Erythema migrans rash with central clearing✓ 정답
3Cardiac conduction abnormalities
4Neurological symptoms including facial palsy
해설
Erythema migrans rash with central clearing is the hallmark sign of early Lyme disease. Other options (severe arthritis, cardiac abnormalities, neurological symptoms) are characteristic of later stages.
Understanding the Clinical Progression of Lyme Disease
Lyme disease, caused by the spirochete Borrelia burgdorferi, progresses through distinct clinical stages if left untreated. Recognizing the hallmark features of each stage is critical for early diagnosis and intervention. The question describes a client with a recent history of potential tick exposure in an endemic area and asks for the finding most characteristic of the early stage of the disease.
According to the provided evidence, the classic and most common early manifestation is a skin lesion called erythema migrans (EM). This rash typically appears at the site of the tick bite within 7 to 14 days and is often described as a "bull's-eye" appearance with central clearing [1]. This finding is a clinical hallmark that can confirm the diagnosis in a symptomatic patient with a history of exposure, even before serologic testing becomes positive.
The other options listed are manifestations of later, disseminated stages of Lyme disease. Understanding this timeline explains why they are not the most characteristic early findings:
Severe arthritis in multiple joints: This is a classic feature of late disseminated Lyme disease, typically occurring months after the initial infection. It most commonly presents as an asymmetric oligoarthritis affecting large joints, especially the knee [2].
Cardiac conduction abnormalities: Lyme carditis occurs in the early disseminated stage, weeks to months after the tick bite. It can present with fluctuating degrees of atrioventricular (AV) block, but it is not the most characteristic finding of the earliest localized stage.
Neurological symptoms including facial palsy: These are manifestations of Lyme neuroborreliosis (LNB), which also occurs in the early disseminated stage. Cranial nerve VII (facial) palsy is a common neurological sign, and a more severe radiculoneuritic presentation is known as Bannwarth syndrome, which can mimic conditions like Guillain-Barré syndrome [2, 3].
Therefore, in a client presenting with fever and headache just two weeks after a high-risk exposure, the presence of an erythema migrans rash with central clearing is the most specific and characteristic finding that aligns with the early, localized stage of Lyme disease. This clinical sign represents the initial host response to the spirochete's proliferation in the skin before hematogenous dissemination occurs [1, 4].
References (research sources)
[1]
Lyme disease presenting with erythema migrans: First reported case in a returning traveler to the Kingdom of Saudi Arabia.Research articleBarry M. (2025) · DOI: 10.1016/j.idcr.2025.e02349
[2]
A Rare Case of Lyme Neuroborreliosis Presenting as Bannwarth Syndrome in Texas.Research articleBhattarai A, Kaur M, Valaparla V, Li X. (2026) · DOI: 10.7759/cureus.109422
Recognizing Early Lyme DiseaseIdentifying Erythema Migrans After Tick Exposure
The hallmark of early localized Lyme disease is Erythema Migrans, a rash appearing 7–14 days after a tick bite. It often presents as a "bull's-eye" lesion with central clearing at the bite site.
Diagnosis in this stage is clinical, based on history of exposure in an endemic area and the characteristic rash. Serologic testing is often negative at this point.
Caution
Do not wait for positive serology to treat if EM is present. Early antibiotic therapy prevents progression to disseminated stages involving joints, heart, or nervous system.
Erythema Migrans — A characteristic 'bull's-eye' skin lesion with central clearing that appears at the tick bite site within 7–14 days, hallmark of early localized Lyme disease.
Borrelia burgdorferi — The spirochete bacterium transmitted by Ixodes ticks that causes Lyme disease.
Early Disseminated Stage — The second stage of Lyme disease occurring weeks to months post-bite, characterized by multiple EM lesions, neurological symptoms, or carditis.
Late Disseminated Stage — The third stage occurring months to years after infection, manifesting as arthritis, typically in large joints like the knee.