TABLE 1.

Summary of study data sets and Salmonella isolates^a

Data set no.	Regionb	Isolation year(s)	Sample group or type	No. of samples	Frequency of positive samples (%)	No. of isolates subtypedc	No. of representative isolatesd	No. of serovars	No. of PFGE types
I	NYS	2009–2011	Total group	588	27 (4.6)e	57	27	7	11
			Soil	178	4 (2.8)
			Drag swab	175	3 (1.7)
			Water	174	16 (9.2)
			Fecal	61	4 (6.6)
II	NYS	2012	Total group	600	26 (4.3)	35	29	9	11
			Soil	263	13 (4.9)
			Drag swab	263	5 (1.9)
			Water	74	8 (10.8)
			Fecal	NCf
III	SFL	2010	Total group	65	23 (35.4)	81	32	11	17
			Soil	8	5 (62.5)
			Drag swab	8	3 (37.5)
			Water	40	15(37.5)
			Fecal	9	0 (0)
IV	NYS	2011	Total group	429	17 (4.0)	44	19	7	9
			Soil	90	2 (2.2)
			Drag swab	219	4 (1.8)
			Water	120	11 (9.2)
			Fecal	NC
V	NYS	2010	Total group	60	5 (8.3)	11	5	4	4
			Soil	20	2 (10)
			Drag swab	20	0 (0)
			Water	13	1 (7.7)
			Fecal	7	2 (28.6)
All			Total group	1,742	98 (5.8)	228	112	20	37
			Soil	559	26 (5.1)
			Drag swab	685	15 (2.2)
			Water	421	51 (12.1)
			Fecal	77	6 (7.8)

^aData set I Salmonella isolates, serovars, and PFGE types have been previously described (26); data set II Salmonella isolates and serovars have been previously described (27); data set III is reported here; data set IV and V Salmonella isolates and serovars are unpublished. See File S1 in the supplemental material for further data set descriptions.

^bNYS, New York State; SFL, South Florida.

^cPFGE (using the restriction enzyme XbaI) was performed on one isolate per Salmonella positive sample for each isolation scheme (up to four isolates could be selected for the schemes RV-XLD, TT-XLD, RV-CHROMagar, and TT-CHROMagar).

^dOnly isolates that were representative(s) of the Salmonella isolated in that sample were kept for further analyses (i.e., isolates from the same sample with identical serovars and PFGE types were excluded).

^eIsolates from one Salmonella-positive sample were unavailable for subtyping.

^fNC, not collected (a certain sample type was not collected for that data set).