Impact of urban contamination of the La Paz River basin on thermotolerant coliform density and occurrence of multiple antibiotic resistant enteric pathogens in river water, irrigated soil and fresh vegetables

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Table 3 Percentage of enteropathogenic bacteria found at La Paz River basin, water, soil and vegetable sampling points

Site/sample	ETEC% (N)^a	EPEC%^d (N)^a	EAEC% (N)^a	Salmonella% (N)^a	EIEC/Shigella%^e (N)a	MEB^b	Any pathogen%^c
1/water	0	0	0	0	0	0	0
2/water	100 (12)	58 (7)	67 (8)	92 (11)	8 (1)	0.54	100
3/water	100 (12)	50 (6)	67 (8)	83 (10)	0	0.50
4/water	83 (10)	33 (4)	50 (6)	92 (11)	17 (2)	0.46
3/soil	67 (8)	25 (3)	33 (4)	33 (4)	33 (4)	0.32	83
3/vegetable	67 (8)	0	17 (2)	33 (4)	0	0.19	67

EHEC was not detected in any of the samples
^a(N) is the number of positive samples detected for each pathogen (i.e. ETEC, EPEC, EAEC, Salmonella and EIEC/Shigella) at each site along the year. A total of 12 samples were collected at each site along the year (1 sample/month)
^bMultiple enteropathogenic bacteria index (MEB)
^cPercentage of positive samples for at least one enteropathogen detected
^dAll EPEC isolates were atypical (bfp negative)
^eAll EIEC/Shigella isolates were non-lactose fermenting colonies