Table 4.

Characteristics of Salmonella Derby isolates belonged to the same PFGE pulsotype

PFGE pulsotype	Biofilm	Resistance profilea	No. of isolates	Sampling	Origin
P3	+	TET	2	II	Submandibular lymph node
					Ground meat
P6	+	AMP-STR-TET	2	II	Submandibular lymph node
					Ground meat
P7	+	Susceptible	2	V	Intestinal content
P8	+	TET	2	VI	Pig carcass
P10	+	CL-TET	2	I	Mesenteric lymph node
				II	Tonsil
		TET	2	I	Intestine fragment
				II	Submandibular lymph node
P11	+	TET	2	IV	Fresh pork sausage
		CL-STR-TET
P12	+	NAL-TET	2	III	Mesenteric lymph node
P13	-	STR-TET	2	VI	Working table for offal
	+	Susceptible	1	II	Ground meat
P15	-	STR-TET	2	II	Intestine fragment
P16	-	STR-TET	2	IV	Fresh pork sausage
			1	V	Pig carcass
		CL-STR-TET	1	VI	Pig carcass
P18	+	TET	2	I	Mesenteric lymph node

^aAMP, ampicillin; CL, colistin; NAL, nalidixic acid; STR, streptomycin; TET, tetracycline