Insights in agricultural practices and management systems linked to microbiological contamination of lettuce in conventional production systems in Southern Brazil

Table 3 Sampling location, sample type, number of samples and results for microbiological analysis

			Hygiene indicators				Pathogen indicator
			*E. coli* (mean and stdv)	Number of samples per *E. coli* counts			*Salmonella*	*E. coli* O157:H7
CSL	Sample	n		<1.0 log	≥1.0 and < 2.0 log	≥2.0 and < 3.0 log	A/P*	A/P*
1	Manure	9	1.11 ± 0.33 cfu/g	8	0	1	A	A
2	Manured soil	9	<1.00 ± 0.00 cfu/g	9	0	0	A	A
3	Soil	27	1.05 ± 0.20 cfu/g	23	3	1	A	A
4	Seedlings in soil	3	1.43 ± 0.75 cfu/g	2	0	1	A	A
5	Seedlings	3	1.00 ± 0.00 cfu/g	2	1	0	A	A
6	Lettuce	27	1.06 ± 0.22 cfu/g	23	3	1	A	A
7	Lettuce after washing	6	1.00 ± 0.00 cfu/g	5	1	0	A	A
8	Rinse water	2	1.00 ± 0.00 MPN/100 ml	2	0	0	A	A
9	Irrigation water source	12	1.03 ± 0.012 MPN/100 ml	10	2	0	A	A
10	Irrigation water from tap	12	1.04 ± 0.12 MPN/100 ml	10	1	1	A	A
11	Swab of farmers’ hands	9	1.00 ± 0.00 cfu/25 cm²	9	0	0	-	-
12	Swab of transport boxes of lettuce	9	1.00 ± 0.01 cfu/25 cm²	9	0	0	-	-
Total		128		112	11	5	-	-

* A: absent in 25 g or 25 ml; P: presence in 25 g or 25 ml; stdv: standard deviation.

ISSN: 2731-9245