A69.2

Clinical Causes: Bite from an infected black-legged tick (Ixodes scapularis or Ixodes ricinus) Presence of the bacterium Borrelia burgdorferi in the tick Prolonged attachment of the tick to the skin (typically over 24 hours) Geographical areas where ticks are prevalent, such as wooded or grassy regions Extended outdoor activities in tick-endemic zones without protective measures

Key Symptoms: Erythema migrans: a characteristic expanding rash, often resembling a bull's-eye, that appears at the bite site Fever and chills Headache and fatigue Muscle and joint aches Swollen lymph nodes In some cases, neurological symptoms like facial paralysis or meningitis Cardiac issues such as irregular heartbeat (less common)

Diagnosis Path: Diagnosis of Lyme disease involves a combination of assessing symptoms, medical history, and exposure risk. Healthcare providers may perform blood tests, such as enzyme-linked immunosorbent assay (ELISA) followed by Western blot testing, to detect antibodies against Borrelia burgdorferi. The presence of erythema migrans, which is considered a hallmark sign, can often lead to a clinical diagnosis without laboratory confirmation. Proper assessment ensures timely and appropriate management.

Treatment Protocols: Lyme disease is typically treated with antibiotics, which are most effective when administered early in the course of the illness. Common antibiotics include doxycycline, amoxicillin, or cefuroxime. The duration of treatment varies depending on the stage and severity of the infection. In cases of neurological or cardiac involvement, more extended or specialized antibiotic therapies may be required. Follow-up care can help monitor recovery and manage persistent symptoms, if any.