title: A novel chromogenic medium for isolation of Pseudomonas aeruginosa from the sputa of cystic fibrosis patients.
abstract: BACKGROUND
  A novel chromogenic medium for isolation and identification of Pseudomonas aeruginosa from sputa of cystic fibrosis (CF) patients was evaluated and compared with standard laboratory methods.
  
  
  METHODS
  One hundred sputum samples from distinct CF patients were cultured onto blood agar (BA), Pseudomonas CN selective agar (CN) and a Pseudomonas chromogenic medium (PS-ID). All Gram-negative morphological variants from each medium were subjected to antimicrobial susceptibility testing, and identification using a combination of biochemical and molecular methods.
  
  
  RESULTS
  P. aeruginosa was isolated from 62 samples after 72 h incubation. Blood agar recovered P. aeruginosa from 56 samples (90.3%) compared with 59 samples (95.2%) using either CN or PS-ID. The positive predictive value of PS-ID (98.3%) was significantly higher than growth on CN (88.5%) for identification of P. aeruginosa (P<0.05).
  
  
  CONCLUSIONS
  PS-ID is a promising medium allowing for the isolation and simultaneous identification of P. aeruginosa from sputa of CF patients.
authors.affiliation: Department of Microbiology, Freeman Hospital, Newcastle upon Tyne, UK.
authors.forename: Larissa
authors.initials: L
authors.lastname: Laine
authors.forename: John D
authors.initials: JD
authors.lastname: Perry
authors.forename: Jenner
authors.initials: J
authors.lastname: Lee
authors.forename: Michelle
authors.initials: M
authors.lastname: Oliver
authors.forename: Arthur L
authors.initials: AL
authors.lastname: James
authors.forename: Corinne
authors.initials: C
authors.lastname: De La Foata
authors.forename: Diane
authors.initials: D
authors.lastname: Halimi
authors.forename: Sylvain
authors.initials: S
authors.lastname: Orenga
authors.forename: Angela
authors.initials: A
authors.lastname: Galloway
authors.forename: F Kate
authors.initials: FK
authors.lastname: Gould
mesh_terms: D000293:Adolescent; D000328:Adult; D000362:Agar; D001431:Bacteriological Techniques; D002648:Child; D002675:Child, Preschool; D002863:Chromogenic Compounds; D003470:Culture Media; D003550:Cystic Fibrosis / Q000382:microbiology*; D006801:Humans; D008875:Middle Aged; D011237:Predictive Value of Tests; D011550:Pseudomonas aeruginosa / Q000302:isolation & purification*; D013183:Sputum / Q000382:microbiology*; D055815:Young Adult
chemical_list: D002863:Chromogenic Compounds; D003470:Culture Media; D000362:Agar