title: Evaluation of the BD Phoenix SMIC/ID, a new streptococci identification and antimicrobial susceptibility panel, for potential routine use in a university-based clinical microbiology laboratory.
abstract: We evaluated the new BD Phoenix automated microbiology system (Becton Dickinson Diagnostic Systems, Sparks, MD) SMIC/ID-4 panel for routine identification (ID) and antimicrobial susceptibility testing (AST) of streptococci in a university-based laboratory. Clinical isolates of Streptococcus pneumoniae (n = 92), Streptococcus pyogenes (n = 24), and Streptococcus agalactiae (n = 10) were collected, and comparisons were made with the routine manual methods used in our microbiology laboratory for ID and susceptibility testing. ID concordance with manual methods was 85.9%, 95.8%, and 90.0% for S. pneumoniae, S. pyogenes, and S. agalactiae, respectively. With respect to AST concordance for S. pneumoniae and beta-hemolytic streptococci (S. pyogenes and S. agalactiae) using Phoenix and standard broth microdilution panels, overall essential agreement was 93.0% and 97.5%, respectively, whereas overall category agreement was 92.4% and 98.9%, respectively. Major and minor error rates for S. pneumoniae and beta-hemolytic streptococci were 0.5% and 0.3%, and 7.1% and 0.8%, respectively. Very major errors were not observed in this study. Mean time for ID and AST test completion was 13.6 +/- 1.6, 10.7 +/- 2.4, and 11.2 +/- 2.3 h for S. pneumoniae, S. pyogenes, and S. agalactiae, respectively. We have demonstrated that Phoenix ID results show high agreement with manual ID and that AST performance was equivalent to standard broth microdilution in less time.
authors.affiliation: Department of Infection Control and Laboratory Diagnostics, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai, 980-8574, Japan. kane2@mail.tains.tohoku.ac.jp
authors.forename: Keiji
authors.initials: K
authors.lastname: Kanemitsu
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kunishima
authors.forename: Ken
authors.initials: K
authors.lastname: Inden
authors.forename: Masumitsu
authors.initials: M
authors.lastname: Hatta
authors.forename: Hideo
authors.initials: H
authors.lastname: Harigae
authors.forename: Kenichi
authors.initials: K
authors.lastname: Ishizawa
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Kaku
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001331:Automation; D015373:Bacterial Typing Techniques / Q000295:instrumentation / Q000379:methods*; D019411:Clinical Laboratory Techniques; D007753:Laboratories; D008826:Microbial Sensitivity Tests; D011933:Reagent Kits, Diagnostic; D012680:Sensitivity and Specificity; D013291:Streptococcus / Q000145:classification / Q000187:drug effects* / Q000378:metabolism; D014495:Universities
chemical_list: D000900:Anti-Bacterial Agents; D011933:Reagent Kits, Diagnostic