TABLE 2.

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

β-Lactamase activitya	No. of ampicillin-susceptible campylobacters (n = 13)b		No. of ampicillin-resistant campylobacters (n = 175)c
	blaOXA-61-positived	blaOXA-61-negativee	blaOXA-61-positive	blaOXA-61-negative
Detected	4	4	136	22
Not detected	0	5	11	6

^aβ-Lactamase activity detected by hydrolysis of nitrocefin.

^bNumber of ampicillin-susceptible (MIC ≤ 4μg/ml) campylobacters.

^cNumber of ampicillin-resistant (MIC ≥ 8 μg/ml) campylobacters.

^dbla_OXA-61-positive, bla_OXA-61 was detected by PCR.

^ebla_OXA-61-negative, no amplimer was obtained for bla_OXA-61.