A 62-year-old man with decompensated alcoholic cirrhosis undergoes a diagnostic paracentesis for new-onset ascites.
His medical history is negative for prior spontaneous bacterial peritonitis (SBP).
The ascitic fluid analysis reveals a total protein of 1.1 g/dL, a serum-ascites albumin gradient (SAAG) of 1.8 g/dL, and an absolute neutrophil count (ANC) of 80 cells/mm³.
His serum creatinine is 1.4 mg/dL and total bilirubin is 3.5 mg/dL.
According to current AASLD guidelines, which of the following is the most appropriate next step regarding SBP prophylaxis?
