Table 3.

Percentage of bacterial recovery from lettuce surface using BPW at different incubation time.

Bacteria	Incubation time (min)	Inoculated bacterium		% recovery
		before elution (cfu/ml)	After elution (cfu/ml)
E. coli o157:h7	30		4×107	90.5
	45	2.5×108	2.4×108	99.79
	60		2.4×108	99.79
S. entrica serv. Typhimurium	30		5.6×107	88.71
	45	2.5×108	2.45×108	99.89
	60		2.4×108	99.78
L. monocytogenes	30		7.6×107	93.83
	45	2.5×108	2.5×108	100
	60		2.5×108	100

cfu/ml= colony forming units per milliliter; % recovery= log final cfu/ml / log initial cfu/ml × 100.