Table 4.

Proven ESBL/AmpC producers (using PCR and ESBL/AmpC genes) from the investigated German broiler fattening farms^b

Detected gene(s)	ESBL/AmpC producer statusa	No. of E. coli isolates	% E. coli isolates (n = 359)
CMY	+	78	21.73
SHV-12	+	47	13.12
CTX-M	+	38	10.59
TEM-52	+	26	7.24
TEM-1	(−)	45	12.54
CMYand TEM-1	+	69	19.22
SHV-12 and TEM-1	+	33	9.12
CTX-M and CMY	+	6	1.67
CTX-M and TEM-1	+	4	1.11
TEM-52 and SHV-12	+	2	0.56
TEM-52 and CMY	+	1	0.28
SHV-12 and CTX-M	+	1	0.28
CTX-M, SHV-12, and TEM-1	+	1	0.28
SHV-12, CMY, and TEM-1	+	1	0.28
Nonec	(−)	7	1.95
Proven ESBL/AmpC producer		307	85.51

^a+, proven to be an ESBL/AmpC producer; (−), still suspected of being an ESBL/AmpC producer.

^bThree hundred fifty-nine E. coli isolates suspected of being ESBL/AmpC producers were examined.

^cNegative in all PCRs.