title: Performance of the Vitek MS v2.0 system in distinguishing Streptococcus pneumoniae from nonpneumococcal species of the Streptococcus mitis group.
abstract: The Vitek MS v2.0 matrix-assisted laser desorption ionization-time of flight mass spectrometry system accurately distinguished Streptococcus pneumoniae from nonpneumococcal S. mitis group species. Only 1 of 116 nonpneumococcal isolates (<1%) was misidentified as S. pneumoniae. None of 95 pneumococcal isolates was misidentified. This method provides a rapid, simple means of discriminating among these challenging organisms.
authors.affiliation: Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts, USA. jbranda@partners.org
authors.forename: John A
authors.initials: JA
authors.lastname: Branda
authors.forename: Rachelle P
authors.initials: RP
authors.lastname: Markham
authors.forename: Cherilyn D
authors.initials: CD
authors.lastname: Garner
authors.forename: Jenna A
authors.initials: JA
authors.lastname: Rychert
authors.forename: Mary Jane
authors.initials: MJ
authors.lastname: Ferraro
mesh_terms: D003951:Diagnostic Errors / Q000706:statistics & numerical data*; D006801:Humans; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*; D013290:Streptococcal Infections / Q000175:diagnosis / Q000382:microbiology*; D034361:Streptococcus mitis / Q000737:chemistry / Q000145:classification* / Q000302:isolation & purification*; D013296:Streptococcus pneumoniae / Q000737:chemistry / Q000145:classification* / Q000302:isolation & purification*