Encephalitis in children is primarily due to a lowered immune resistance, which leads to infection by certain viruses. These viruses invade the nervous system, causing damage to neurons, resulting in symptoms such as fever, headache, nausea, and vomiting. Generally, the main tests for pediatric encephalitis include hematological tests related to bleeding, primarily involving routine blood tests, C-reactive protein, and erythrocyte sedimentation rate. These indices can reflect the inflammatory conditions inside the patient's body, helping to distinguish between viral and bacterial infections. Another very important auxiliary examination is the electroencephalogram (EEG), where pediatric encephalitis can show mild to moderate abnormalities, which is helpful for accurate diagnosis. The third examination involves performing a lumbar puncture to test the cerebrospinal fluid (CSF) for the levels of white cells, glucose, and chloride, which are crucial for diagnosing encephalitis and differentiating it from other types of encephalitis.