Table 2.

Comparison of genotypic and phenotypic resistance to antibiotics in C. coli isolated from Italian pigs and wild boars.

Antibiotic class	Antibiotics	Genes	Animals	No. of isolates with R phenotype a (n=178)	No. of isolates with R genotype b	Concordance rate d
Aminoglycosides	Gentamicin (GEN)	aph(3’)-III	Pig	n=24	n= 9	37.5
			Wild boar	n=7	n=0	0
	Streptomycin (STR)	rpsL- aph(3’)-III	Pig	n=154	n=2; n=23	1.3–15
			Wild boar	n=37	n=0	0
Beta-lactams c	–	OXA-61	Pig	–	n=89	–
			Wild boar	–	n=27	–
Fluoroquinolones/ Quinolones	Ciprofloxacin (CIP)/ Nalidixic acid (NAL)	gyrA	Pig	n=129; n=121	n=99; n=95	76.7–78.5
			Wild boar	n=10; n=16	n=6; n=5	60–31.2
Macrolides	Erythromycin (ERY)	23S rRNA	Pig	n=65	n=51	78.5
			Wild boar	n=2	n=2	100
Tetracyclines	Tetracycline (TET)	Tet(O)	Pig	n=160	n=88	55
			Wild boar	n=16	n=11	68.7
Multidrug CmeABC efflux system and cmeR		cmeA,cmeB,cmeC, cmeR	Pig	–	n=153; n=132; n=130; n=129	–
			Wild boar	–	n=60; n=58; n=57; n=57	–

^aNumber of isolates expressing the resistance phenotype for the corresponding antibiotic;

^bNumber of isolates expressing the resistance phenotype for the corresponding antibiotic, that have the indicated gene;

^cAntibiotic class does not tested for resistance phenotype;

^dConcordance rate (%).