TABLE 2

Culture characteristics

Culture characteristicsNo. (%)
Specimen Gram stain
    Polymorphonuclear leukocytes
        None34 (49)
        Rare/few21 (30)
        Moderate/abundant15 (21)
    Gram-positive cocci present42 (60)
    PMNs and Gram-positive cocci present22 (31)
Βeta-hemolysis on blood agar78 (96)
Method of SIG identification
    Phenotypic29 (36)
        Errors in initial identification6 (21)
    MALDI-TOF MSa52 (64)
        Errors in initial identification0 (0)
PYRb
    Positive26 (96)
    Negative1 (4)
Staphylococcal latex agglutination
    Positive6 (15)
    Negative19 (47.5)
    Questionable15 (37.5)
  • a Matrix-assisted laser desorption ionization–time of flight mass spectrometry with Bruker Biotyper.

  • b Pyrrolidonyl arylamidase.