Genetic Background of Antimicrobial Resistance in Multiantimicrobial-Resistant Escherichia coli Isolates from Feces of Healthy Broiler Chickens in Tunisia

Table 2

Resistance to different antimicrobial families according to the presence or absence of integrons.

Types of isolates	Number of isolates resistant to the following number of antimicrobial families:
	<2^a	3	4	>5^b
Integron positive ()	2	10	16	30
Integron negative ()	12	4	3	6

^aIntegron-negative isolates were more frequently resistant to 2 or less families of antimicrobials than integron-positive isolates (). ^bIntegron-positive isolates were more frequently resistant to 5 or more families of antimicrobials than integron-negative isolates ().