a 67-year - old man developed serratia marcescens peritonitis within a week of commencing peritoneal dialysis . 
 dialysate cultures isolated multidrug - resistant s.  marcescens , which was treated with intraperitoneal meropenem . 
 this unusual case highlights the problem of multidrug - resistant peritoneal dialysis infections and the potential viability of intraperitoneal meropenem as ambulatory peritonitis therapy .