Table 3. Comparison of DAS-ELISA with duplex-PCR for field samples detection.

	DAS-ELISA			duplex-PCR		Both
Samples	total	+	-	+	-	+	-
cow swab	198	33	156	35	154	32	147
raw milk	48	2	46	3	45	2	45
water contaminated with cow feces	73	12	61	12	61	11	61
vegetable	60	7	53	7	53	7	53
beef	62	3	59	3	59	3	55
fish	57	10	47	11	46	10	42
total	498	67	431	71	427	65	403