Aspiration also provides a culture for histologic exam. The choice of antibiotics depends upon patient risk factors (for details, seeRisk Factors, below) and the causative organism(s). An example of an antibiotic regimen used to treat BA in children is penicillin combined with a third-generation cephalosporin (e.g., cefotaxime, ceftriaxone) and metronidazole. Nafcillin is prescribed for the treatment of S. aureus infection. I.V. antibiotics are followed by oral antibiotics for 2−3 months