PLE-3252

A 39-year-old man was rushed to the hospital because of decreasing sensorium. His condition started with fever and headache, which didn’t improve with Paracetamol. The condition progressively worsened with the development of photophobia and decreasing sensorium. At the ER, the patient was still febrile with a GCS of 5, and positive Brudzinski and Kernig’s signs were observed. Petechial rashes were noted on both lower extremities. As the medical intern who intubated the patient, which of the following prophylactic managements should you do?