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Emergency and Acute Medicine – Tick Bite
Tick bites are a common presentation, but the actual risk of acquiring a tick-borne infection is low, even in endemic areas. Most patients seek care because of concern about Lyme disease, proper tick removal, or local skin reactions rather than true systemic illness.
Ticks belong to two main groups: soft ticks (such as Ornithodoros), which feed briefly and are rarely noticed, and hard ticks (especially Ixodes and Dermacentor), which feed for several days and are more clinically relevant. Lyme disease is most commonly transmitted by the nymph stage of Ixodes scapularis (deer tick). Transmission generally requires prolonged attachment, typically 24–48 hours, and the degree of tick engorgement serves as an important indicator of duration and risk.
Clinically, patients usually present with a visible tick attached to the skin and are often otherwise asymptomatic. There may be mild local irritation, redness, or swelling. Patient anxiety about infection is very common. However, red flags include fever after a tick bite, neurologic symptoms (particularly in children, where tick paralysis must be considered), or signs of systemic illness such as hypotension or sepsis, which may suggest serious infections like Rocky Mountain spotted fever, anaplasmosis, or babesiosis. Because early diagnostic tests are often not helpful, these conditions are largely diagnosed based on clinical presentation and epidemiologic context.
Routine laboratory testing is not indicated for simple tick bites. Lyme serology is not useful immediately after a bite because it reflects prior exposure rather than acute infection, and testing the tick itself is not recommended. Management therefore focuses primarily on proper tick removal and clinical observation.
The most important step in management is early and proper removal of the tick. This is done using fine forceps, grasping the tick as close to the skin as possible, and applying slow, steady upward traction over 30–120 seconds. The tick should not be squeezed, twisted, burned, or covered with substances such as petroleum jelly, as these methods may increase the risk of pathogen transmission. If mouthparts remain embedded in the skin, they may cause local irritation or a foreign body reaction but do not increase the risk of systemic infection.
Antibiotic prophylaxis for Lyme disease is only indicated in specific circumstances. These include identification of an engorged Ixodes scapularis tick, likely attachment for at least 24–48 hours, and removal within 72 hours. In such cases, a single dose of doxycycline 200 mg is recommended. In children, a single-dose regimen is not well studied, and amoxicillin for 10 days may be used instead. There is no evidence to support prophylactic antibiotics for other tick-borne diseases.
Supportive care consists of wound cleaning, reassurance, and education. Most patients can be safely discharged after tick removal. Admission is reserved for those with signs of systemic illness, tick paralysis, or severe tick-borne infection.
Patients should be advised to seek medical attention if they develop fever, rash (particularly an expanding rash suggestive of erythema migrans), joint pain, or neurologic symptoms. Preventive counseling is important and includes the use of insect repellents such as DEET and wearing permethrin-treated clothing in endemic areas.
Key clinical pearls include the importance of early tick removal in reducing infection risk and the selective—not routine—use of antibiotic prophylaxis. Clinicians should always inquire about tick exposure in febrile patients. In children presenting with unexplained weakness, especially girls with long hair, careful scalp examination is essential to rule out tick paralysis.
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