title: Assessment of the FAN anaerobic bottle for culture of continuous ambulatory peritoneal dialysis fluid using the BacT/Alert system.
abstract: The purpose of this study was to determine if the newly available FAN anaerobic bottle (FANAN) alone would be comparable to the combination of the FAN aerobic (FANAE) plus the standard BacT/Alert anaerobic (REGAN) bottles for culture of continuous ambulatory peritoneal dialysis (CAPD) fluid from patients with CAPD peritonitis. CAPD fluid (10 mL) was injected into each bottle, which was then monitored by the BacT/Alert instrument by using a 7-day protocol. Aerobic and anaerobic terminal subculture were performed on all bottles before they were classified as being culture negative. There were 181 effluents received that were suitable for analysis. Growth was detected in 76 (42%) effluents by at least one method. FANAE was the single best medium detecting 84/96 (88%) of all organisms whereas the FANAN and REGAN each detected 69/96 (72%). The combination of FANAE and REGAN bottles detected 92/96 (96%) isolates, which was significantly better than the FANAN or FANAE alone for isolate recovery (p < 0.001). The isolates that were missed by the FANAN but that were recovered by either FANAE or REGAN were all facultative anaerobes commonly detected in CAPD fluids. Terminal subculture revealed otherwise undetected pathogens in 3.9% of positive effluents, usually Pseudomonas aeruginosa. Based on our data, FANAE was the single best bottle for detection of CAPD peritonitis and, in combination with an anaerobic bottle, detected growth from the most effluents. FANAN alone could not substitute for the FANAE/REGAN combination. Although terminal subculture remains controversial, we recommend routine aerobic subculture to ensure that no P. aeruginosa isolates are missed.
authors.affiliation: Departments of Medical Microbiology and Medicine, University of Manitoba, Winnipeg, Manitoba, Canada.
authors.forename: P
authors.initials: P
authors.lastname: Van Caeseele
authors.forename: M J
authors.initials: MJ
authors.lastname: Alfaa
authors.forename: G K
authors.initials: GK
authors.lastname: Harding
mesh_terms: D000693:Anaerobiosis; D001431:Bacteriological Techniques; D003470:Culture Media; D004755:Enterobacteriaceae / Q000254:growth & development*; D010529:Peritoneal Cavity / Q000382:microbiology*; D010531:Peritoneal Dialysis, Continuous Ambulatory / Q000009:adverse effects*; D010538:Peritonitis / Q000382:microbiology*; D011933:Reagent Kits, Diagnostic; D013211:Staphylococcus aureus / Q000254:growth & development*
chemical_list: D003470:Culture Media; D011933:Reagent Kits, Diagnostic