Table 2.

Loop-mediated isothermal amplification results of different ready to eat fresh produce samples prior inoculated with different dilutions of L. monocytogenes during a 3-day period.

RTE fresh produce	Corresponding initial inoculum (CFU/g)	LAMP-LIS (day 0)	LAMP-LIS (day 1)	LAMP-LIS (day 2)
Romaine lettuce	1*10^0	-	-	+
	1*10^1	-	+	+
	1*10^2	-	+	+
	1*10^3	-	+	+
	1*10^4	-	+	+
	1*10^5	-	+	+
	1*10^6	-	+	+
	1*10^7	+	+	+
	1*10^8	+	+	+
Strawberries
	2*10^0	-	-	+
	2*10^1	-	-	+
	2*10^2	-	-	+
	2*10^3	-	-	+
	2*10^4	-	+	+
	2*10^5	-	+	+
	2*10^6	-	+	+
	2*10^7	+	+	+
	2*10^8	+	+	+
Cherry tomatoes
	1*10^0	-	-	+
	1*10^1	-	-	+
	1*10^2	-	+	+
	1*10^3	-	+	+
	1*10^4	-	+	+
	1*10^5	-	+	+
	1*10^6	-	+	+
	1*10^7	-	+	+
	1*10^8	+	+	+
Green onions
	2*10^0	-	-	+
	2*10^1	-	-	+
	2*10^2	-	-	+
	2*10^3	-	+	+
	2*10^4	-	+	+
	2*10^5	-	+	+
	2*10^6	-	+	+
	2*10^7	+	+	+
	2*10^8	+	+	+
Sour berries	1*10^0	-	-	+
	1*10^1	-	-	+
	1*10^2	-	-	+
	1*10^3	-	-	+
	1*10^4	-	+	+
	1*10^5	-	+	+
	1*10^6	+	+	+
	1*10^7	+	+	+

RTE, ready to eat; CFU, colony-forming units; LAMP, loop-mediated isothermal amplifications; LIS, Listeria. Day 0, fresh produce sample with PBW without enrichment; day 1, fresh produce sample in YPCE enriched at 37°C for 24h; day 2, fresh produce sample in YPCE enriched at 37°C for 48h.