TABLE 2.

Association between the presence of Cj0299 (blaOXA-61) and β-lactamase production in ampicillin-susceptible and -resistant Campylobacter spp.

β-Lactamase activityaNo. of ampicillin-susceptible campylobacters (n = 13)bNo. of ampicillin-resistant campylobacters (n = 175)c
blaOXA-61-positivedblaOXA-61-negativeeblaOXA-61-positiveblaOXA-61-negative
Detected4413622
Not detected05116
  • a β-Lactamase activity detected by hydrolysis of nitrocefin.

  • b Number of ampicillin-susceptible (MIC ≤ 4μg/ml) campylobacters.

  • c Number of ampicillin-resistant (MIC ≥ 8 μg/ml) campylobacters.

  • d blaOXA-61-positive, blaOXA-61 was detected by PCR.

  • e blaOXA-61-negative, no amplimer was obtained for blaOXA-61.