title: Evaluation of bacterial biofilms in chronic rhinosinusitis.
abstract: OBJECTIVE
  We investigated the presence of biofilms in patients with chronic rhinosinusitis.
  
  
  METHODS
  Prospective study.
  
  
  METHODS
  Thirty patients with chronic rhinosinusitis scheduled for endoscopic sinus surgery were enrolled in this study. Nasal swab cultures were taken at the time of surgery. Samples were cultured using conventional methods for Haemophilus influenzae, Pseudomonas aeruginosa, Streptococcus pneumoniae, and Staphylococcus aureus.
  
  
  METHODS
  Culture-positive samples were evaluated for slime-forming ability. Qualitative detection of biofilm formation by all slime-producing strains was studied by culturing the strains on Congo red agar plates.
  
  
  RESULTS
  Twenty-three of 30 patients' samples were culture positive (76.6%). Thirteen S. aureus and 10 P. aeruginosa cultures were identified on 23 specimens. Bacterial biofilms were present on 15 of 23 (65.2%) culture-positive specimens. Nine of 13 (69.2%) S. aureus cultures and 6 of 10 (60%) P. aeruginosa cultures produced bacterial biofilms.
  
  
  CONCLUSIONS
  This conventional method is capable of demonstrating biofilm-forming ability in bacteria recovered from patients with chronic rhinosinusitis. The biofilm-forming ability was higher in S. aureus compared with P. aeruginosa.
authors.affiliation: Department of Otolaryngology, Clinical Microbiology Laboratory, Ataturk Training and Research Hospital, Izmir, Turkey.
authors.forename: Semih
authors.initials: S
authors.lastname: Oncel
authors.forename: Ercan
authors.initials: E
authors.lastname: Pinar
authors.forename: Gamze
authors.initials: G
authors.lastname: Sener
authors.forename: Caglar
authors.initials: C
authors.lastname: Calli
authors.forename: Umit
authors.initials: U
authors.lastname: Karagoz
mesh_terms: D000328:Adult; D018441:Biofilms; D002908:Chronic Disease; D004269:DNA, Bacterial / Q000378:metabolism*; D005005:Ethmoid Sinus / Q000378:metabolism; D005260:Female; D006193:Haemophilus influenzae / Q000302:isolation & purification / Q000378:metabolism; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011550:Pseudomonas aeruginosa / Q000302:isolation & purification / Q000378:metabolism; D020545:Respiratory Mucosa / Q000378:metabolism*; D012221:Rhinitis, Allergic, Perennial / Q000382:microbiology*; D013211:Staphylococcus aureus / Q000302:isolation & purification / Q000378:metabolism; D013296:Streptococcus pneumoniae / Q000302:isolation & purification / Q000378:metabolism; D055815:Young Adult
chemical_list: D004269:DNA, Bacterial