TABLE 1.

Salmonella-positive samples collected during fall 2012 and spring 2013^a

Sample no.	Date collected	Sample typeb	Region	Farming system	Farm no.	Salmonella		Serovar
						qPCR positive for invA	Culture confirmed
1	24 September 2012	Spinach	Delaware	Organic	DE3	Yes	No
2	24 September 2012	Field soil	Eastern Shore	Organic	ES1	Yes	No
3	24 September 2012	Bok choy	Central Maryland	Organic	MD8	Yes	No
4	24 September 2012	Spinach	New Jersey	Organic	NJ6	Yes	No
5	1 October 2012	Groundwater	New Jersey	Conventional	NJ10	Yes	No
6	1 October 2012	Groundwater	New Jersey	Conventional	NJ12	Yes	No
7	9 October 2012	Bok choy	Eastern Shore	Organic	ES1	Yes	Yes	Newport
8	9 October 2012	Spinach	New Jersey	Organic	NJ7	Yes	No
9	9 October 2012	Spinach	New Jersey	Organic	NJ5	Yes	No
10	9 October 2012	Groundwater	New Jersey	Organic	NJ5	Yes	No
11	15 October 2012	Spinach	New Jersey	Conventional	NJ10	Yes	Yes	Mbandaka
12	15 October 2012	Spinach	New Jersey	Conventional	NJ10	Yes	Yes	Mbandaka
13	15 October 2012	Spinach	New Jersey	Conventional	NJ11	Yes	Yes	Mbandaka
14	15 October 2012	Spinach	New Jersey	Conventional	NJ12	Yes	Yes	Mbandaka
15	15 October 2012	Kale	Delaware	Organic	DE5	Yes	Yes	Mbandaka
16	22 October 2012	Spinach	Central Maryland	Organic	MD2	Yes	Yes	Braenderup
17	22 October 2012	Spinach	Central Maryland	Organic	MD8	Yes	Yes	Braenderup
18	13 May 2013	Groundwater	New Jersey	Conventional	NJ11	Yes	No
19	13 May 2013	Pond water	New Jersey	Conventional	NJ14	Yes	No
20	13 May 2013	Field soil	New Jersey	Conventional	NJ15	Yes	No
21	13 May 2013	Pond water	New Jersey	Organic	NJ7	Yes	No
22	20 May 2013	Lettuce	Delaware	Organic	DE1	Yes	No
23	20 May 2013	Collards	Delaware	Organic	DE6	Yes	No
24	20 May 2013	Pond sediment	New Jersey	Organic	NJ7	Yes	Yes	Thompson

^aTotal number of samples by region: 140 (central Maryland), 80 (Eastern Shore), 74 (Delaware), and 283 (New Jersey).

^bLeafy greens samples include both random and targeted; irrigation water samples include both source and end of line.