Autoimmune Hepatitis — Practice

A 60-year-old man with known liver cirrhosis due to hepatitis C presents with acute onset fever, abdominal pain, and worsening confusion. Paracentesis reveals ascitic fluid with neutrophil count of 350 cells/mm3 and ascitic fluid albumin-to-serum albumin gradient of >1.1 g/dL. Gram stain is negative. What is the most appropriate empirical treatment?