Is antibiotic therapy currently the first step in the treatment of infected acute necrotic collections of the pancreas?

A 48-year-old lady with pre-existing type 2 diabetes mellitus presented with abdominal pain consistent with acute pancreatitis. There were two positive systemic inflammatory response syndrome (SIRS) criteria (heart rate and respiratory rate) along with an elevated serum lipase (3500IU/L), glucose (270mg/dL), and serum creatinine (2.3mg/dL). Oliguria and elevated creatinine responded to fluid resuscitation. Close to discharge, on day 14, she developed fever (up to 39°C), abdominal pain, leucocytosis (16,000cmm) and a raised C-reactive protein level (245mg/L). A Computed Tomography (CT) scan revealed moderate pleural effusions, pancreatic necrosis with gas, and a small volume (~50ml) of fluid not encapsulated or readily drainable.