Screening of photochemically grafted polymer films for compatibility with osteogenic precursor cells

Nina Adden, Andrea Hoffmann, Gerhard Gross, Henning Windhagen, Fritz Thorey, Henning Menzel
2007 Journal of Biomaterials Science. Polymer Edition  
The goal of this pilot study was to design an external quality assessment (EQA) scheme for German cystic fibrosis (CF) clinical microbiology laboratories. Therefore, a multicentre-study of 18 German CF laboratories was performed to evaluate their proficiency in analysing CF respiratory secretions. Methods: Simulated clinical specimens containing a set of four frequent CF pathogens, namely two Pseudomonas aeruginosa strains differing in morphotype (mucoid versus non-mucoid) and resistotype, one
more » ... d resistotype, one Staphyloccocus aureus strain and one Burkholderia multivorans strain, were distributed to each laboratory. Isolation, identification and antimicrobial susceptibility testing (AST) of any bacterial pathogen present and completion of a questionnaire about applied microbiological protocols were requested. Results: Three of four strains were isolated and identified correctly by almost all laboratories. B. multivorans was once misidentified as B. cenocepacia. Fourteen laboratories failed to detect the second multidrug resistant P. aeruginosa isolate. AST errors occured most often for P. aeruginosa 2 followed by B. cepacia complex, P. aeruginosa 1 and S. aureus. Evaluation of the questionnaires revealed major differences in cultivation and identification techniques applied by the participating laboratories. Conclusions: A periodical EQA programme for German CF laboratories and standardized microbiological procedures seem to be necessary to advance diagnostic microbiology employed on CF respiratory tract specimens and may help to improve antiinfective treatment and infection control practices for CF patients.
doi:10.1163/156856207779996896 pmid:17471767 fatcat:rtrxycuivjednayyfsaqptz6pq