A84.9

Clinical Causes: Infection with tick-borne viruses, such as the tick-borne encephalitis virus Transmission through the bite of infected ticks, primarily of the Ixodes species Exposure to tick habitats, especially in wooded or grassy areas In certain regions, increased tick activity during warmer months can elevate risk

Key Symptoms: Fever and chills Headache and neck stiffness Fatigue and muscle weakness Nausea and vomiting Sensitivity to light (photophobia) Altered mental state, including confusion or drowsiness Seizures, in severe cases Focal neurological deficits, such as weakness or numbness

Diagnosis Path: Diagnosis typically involves a combination of medical history, including recent tick exposure, clinical examination, and laboratory tests. Blood tests can detect antibodies against the virus, while cerebrospinal fluid (CSF) analysis may show signs of inflammation. Imaging studies like MRI or CT scans can assist in assessing neurological involvement, but they are not specific for TBE. Because symptoms can mimic other neurological conditions, healthcare providers may perform a range of diagnostic tests to confirm the infection.

Treatment Protocols: There is no specific antiviral treatment for tick-borne viral encephalitis. Management mainly focuses on supportive care, including hospitalization if necessary, to monitor and treat complications. Patients may receive hydration, fever control, and medications to manage neurological symptoms. Prevention through vaccination and avoiding tick bites is the most effective approach to reducing risk.