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. 2008 Feb 27;46(5):1818–1823. doi: 10.1128/JCM.02255-07

TABLE 3.

Nucleotide mutations that cause amino acid substitutions in gyrase and topoisomerase IV in fluoroquinolone-resistant S. pseudintermedius

Strain Presence or absence of the indicated mutation in the following gene:
MIC (μg/ml) for enrofloxacin gyr/grl group
grlA
grlB
gyrA
gyrB T720G (Phe240Leu)
G239T (Ser80Ile)a G250A (Asp84Asn)a A1832T (Gln611Leu) T2243C (Val748Ala) T645G (Asp215Glu) T1241C (Leu414Ser) C251T (Ser84Leu)a A263G (Glu88Gly)a A2032G (Thr678Ala) G2140A (Glu714Lys) T2201G (Leu734Arg) C2208A (Asn736Lys) T2511A (Asp837Glu)
Fluoroquinolone susceptible
    CCUG 49543T ≤0.25
    KM337 ≤0.25
    KM1087 ≤0.25
    KM1250 ≤0.25
Fluoroquinolone resistant
    KM241 + + + + + 4 1
    KM1591 + + + 8 2
    SD1071 + + + + + 8 3
    KM1395 + + + + + >16 4
    SD91 + + + + 16 5
    KM1381 + + + + 16 5
    KM631 + + + + 16 5
    KM1832 + + + + 16 5
    KM1896 + + + + 16 5
    KM336 + + + + 16 5
    KM571 + + + + >16 5
    KM1542 + + + + >16 5
a

Amino acid substitution known to confer fluoroquinolone resistance in S. aureus (8, 13, 14, 18, 27, 30).