title: Evaluation of the enhanced bacterial detection system for screening of contaminated platelets.
abstract: BACKGROUND
  The Pall third-generation enhanced bacterial detection system (eBDS) was recently approved for detection of bacterial contamination in leukoreduced platelets (PLTs). The method is based on the measurement of the oxygen content as a marker for bacteria. eBDS incorporates major modifications including removal of the sample-set filter, modification of the culture medium, and incubation with agitation of the sample pouch.
  
  
  METHODS
  Ten whole blood-derived random-donor PLT units collected on Day 1 after donation and 10 single-donor apheresis PLT units were spiked with low levels of bacteria in three different blood transfusion centers. Inoculation was performed at a final concentration of 5 to 50 colony-forming units per mL with reference strains of five organisms involved in severe transfusion-associated infections. PLT units were stored at 22 degrees C for 24 hours before sampling. Six sample sets were then sterile-connected to each unit and placed on a horizontal agitator at 35 degrees C for 18 or 24 hours of incubation.
  
  
  RESULTS
  No false-positive results were obtained, indicating a 100 percent specificity of the assay. Of 126 spiked sample pouches tested, 61 of 63 (96.82%) and 63 of 63 (100%) were detected positive after 18 or 24 hours of incubation, respectively. In the two missed cases that failed to detect Bacillus cereus, the measured oxygen was slightly above the detection threshold but was markedly different from the negative samples.
  
  
  CONCLUSIONS
  The eBDS method allows definitive testing of PLTs as soon as 42 hours after collection and offers an alternative culture method to the BacT/ALERT system.
authors.affiliation: French Blood Establishment, Montpellier, Besançon, Lille, France.
authors.forename: Chantal
authors.initials: C
authors.lastname: Fournier-Wirth
authors.forename: Marie
authors.initials: M
authors.lastname: Deschaseaux
authors.forename: Christine
authors.initials: C
authors.lastname: Defer
authors.forename: Sylvain
authors.initials: S
authors.lastname: Godreuil
authors.forename: Christian
authors.initials: C
authors.lastname: Carrière
authors.forename: Xavier
authors.initials: X
authors.lastname: Bertrand
authors.forename: Virginie
authors.initials: V
authors.lastname: Tunez
authors.forename: Thierry
authors.initials: T
authors.lastname: Schneider
authors.forename: Joliette
authors.initials: J
authors.lastname: Coste
authors.forename: Pascal
authors.initials: P
authors.lastname: Morel
mesh_terms: D001419:Bacteria / Q000302:isolation & purification*; D001424:Bacterial Infections / Q000517:prevention & control*; D001771:Blood Banks; D001792:Blood Platelets / Q000382:microbiology*; D001793:Blood Preservation; D017848:Blood-Borne Pathogens / Q000302:isolation & purification*; D005069:Evaluation Studies as Topic; D005189:False Positive Reactions; D006801:Humans; D008828:Microbiological Techniques / Q000295:instrumentation*; D012680:Sensitivity and Specificity