A 53-year-old female patient was admitted to the hospital because of headache worsening for the last few days, fever (38.8 Celsius), nausea. On examination: lethargy and drowsiness, nuchal rigidity 3 fingers, Kernig’s sign present. Cerebrospinal fluid (CSF) testing: cloudy, opalescent, protein level 220 mg/dL ( 2.2g/L), cytosis 390 white
cells per mm (granulocytes 70%), glucose level 40 mg/dL (2.2 mmol/L). Serum glucose
level 100 mg/dL (5.55 mmol/L). Which of the following should be done during the first
24-hour in-hospital stay?