TABLE 4.

Antimicrobial susceptibility patterns of S. gallolyticus subsp. gallolyticus, S. gallolyticus subsp. pasteurianus, and S. infantarius subsp. coli

Species and antimicrobial agentMIC (μg/ml)Susceptibility categorya
Range50%90%SusceptibleIntermediateResistant
S. gallolyticus subsp. gallolyticus (n = 29)
    Ceftriaxone0.12-0.250.250.2529/29 (100)0/29 (0)0/29 (0)
    Erythromycin0.03->320.12>3217/29 (59)1/29 (3)11/29 (38)
    Levofloxacin1-8242/29 (7)27/29 (93)0/29 (0)
    Meropenem≤0.03≤0.03≤0.0329/29 (100)0/29 (0)0/29 (0)
    Penicillin0.06-0.120.060.1229/29 (100)0/29 (0)0/29 (0)
    Tetracycline0.5->6464>649/29 (31)0/29 (0)20/29 (69)
    Vancomycin0.25-0.50.50.529/29 (100)0/29 (0)0/29 (0)
S. gallolyticus subsp. pasteurianus (n = 12)
    Ceftriaxone0.12-0.250.250.2512/12 (100)0/12 (0)0/12 (0)
    Erythromycin0.06->320.12>328/12 (67)0/12 (0)4/12 (33)
    Levofloxacin2->64480/12 (0)11/12 (92)1/12 (8)
    Meropenem≤0.03-0.06≤0.03≤0.0312/12 (100)0/12 (0)0/12 (0)
    Penicillin0.06-0.120.060.1212/12 (100)0/12 (0)0/12 (0)
    Tetracycline0.25->6464>642/12 (17)0/12 (0)10/12 (83)
    Vancomycin0.25-0.50.50.512/12 (100)0/12 (0)0/12 (0)
S. infantarius subsp. coli (n = 17)
    Ceftriaxone≤0.03-0.250.250.2517/17 (100)0/17 (0)0/17 (0)
    Erythromycin0.06->320.060.1216/17 (94)0/17 (0)1/17 (6)
    Levofloxacin1->322321/17 (6)14/17 (82)2/17 (12)
    Meropenem≤0.03-0.06≤0.030.0617/17 (100)0/17 (0)0/17 (0)
    Penicillin0.06-0.120.120.1217/17 (100)0/17 (0)0/17 (0)
    Tetracycline0.25->648>648/17 (47)1/17 (6)8/17 (47)
    Vancomycin0.25-0.50.50.517/17 (100)0/17 (0)0/17 (0)
  • a Values are the numbers of isolates belonging to a certain category; percentages are in parentheses.