TABLE 3.

Occurrence of the Salmonella serovar Typhimurium DT12 test strain and other Salmonella serotypes in pigs and the environment of paddocks A to F in three periods

Periodb	Wk	No. of Salmonella-positive samples or other Salmonella serotypes in paddocka:
		Ac		Bc		C		D		E		F
		Pigs	ENV	Pigs	ENV	Pigs	ENV	Pigs	ENV	Pigs	ENV	Pigs	ENV
1	1					1		2	1	3	4	6	5
	2					2	1	2	1	3	6	8	6
	3					2	1	2	1	2	4	9	7
	4						1		2	1	6	8	7
	5					Gol		2	3	5	6	9	6
	6					2	3	6	3	4	5	9	6
2	1					107	Ana		1		5	2	6
									170
	2				Ana	New	Ana	2	2		4	5	6
						107			170
	3		Rea			107	New		1		2	8	6
									170
	4	Gol	109			107	1		1		3	5	6
			ND (3)				107		170
							Sta		Uga
	5	Der				Liv	41		Uga		3	2	6
		Der				41	170				170
	6	Der				41	Liv		41		2	4	7
3	1	New	New			1	3	6	6	5	2		5
			New			107
			Ohio
	2		New			2	2	5	7	1	3	1	4
			New				New			107
	3		New	RDNC		1	2	4	4	1	1	1	4
			109	109	109	Ind			RDNC	107
	4	3.10:	New	1		1	Liv	4	5	2	1	1	5
						4.12:		4.12:
								Ago
	5		1				1	2	3	3			4
	6				Ohio	1	3	2	4	3	2		4
							NT		109	109	109
											Uga

^aThe numbers refer to the number of times the Salmonella test strain was detected on each sampling occasion. Additional detection of other Salmonella serotypes is shown with the following abbreviations: Ana, Anatum; Ago, Agona; Der, Derby; Gol, Goldcoast; Ind, Indiana; Liv, Livingstone; New, Newport; Rea, Reading; Sta, Stanley; Uga, Uganda; 4.12:, 4.12:d:−; 3.10:, 3.10:−:1.5; NT, not typeable; ND, not serotyped. 41, 107, 109, and 170 are phage type (DT) numbers of serovar Typhimurium; RDNC, unspecific phage type.

^bThree experimental periods each lasting 6 weeks, running from late April to the beginning of September.

^cPaddocks A and B are Salmonella-negative control paddocks.