A 93-year-old woman is seen on the acute ward round with refractory Clostridium difficile infection. She has already received 2 weeks of oral metronidazole, oral vancomycin and intravenous metronidazole.
Which of the following may be implemented as the next line of management?
Probiotics
IV Vancomycin
Fidaxomicin
Meropenem
IV Immunoglobulins (IVIg)