TABLE 4.

Concentrations of total E. coli and E. coli O157 detected in environmental samples by culture methods

Sitea	Value (CFU ml−1) for the month of:
	Februaryb	Aprilb	Julyb	Augustb	Septemberb	Aprilc	Julyc	Augustc	Septemberc
Raw	2.0 × 104 ± 0.4 × 103	3.9 × 107 ± 4.2 × 105	1.6 × 106 ± 1.7 × 105	1.1 × 107 ± 4.2 × 104	5.0 × 103 ± 1.7 × 103	3.8 × 106 ± 3.4 × 104	1.6 × 106 ± 1.5 × 104	1.1 × 106 ± 5.2 × 104	1.0 × 102 ± 1.8 × 101
Pond	2.2 × 104 ± 1.0 × 103	5.6 × 104 ± 7.4 × 103	1.2 × 103 ± 2.8 × 102	1.5 × 103 ± 2.5 × 102	1.2 × 103 ± 2.8 × 102	8.0 × 102 ± 1.2 × 102	8.2 × 102 ± 2.7 × 102	4.2 × 102 ± 1.0 × 102	8.9 × 102 ± 1.2 × 102
W1 Inf	1.1 × 104 ± 1.3 × 103	4.7 × 104 ± 3.9 × 103	2.4 × 103 ± 6.9 × 102	2.4 × 103 ± 6.9 × 102	1.1 × 104 ± 6.5 × 102	5.0 × 103 ± 2.3 × 103	2.1 × 103 ± 1.3 × 102	6.3 × 103 ± 1.5 × 102	5.1 × 102 ± 8.6 × 101
W1 Eff	2.4 × 102 ± 0.2 × 102	7.5 × 102 ± 1.4 × 102	1.3 × 102 ± 5.9 × 101	1.3 × 102 ± 5.9 × 101	1.0 × 103 ± 5.9 × 101	8.3 × 101 ± 1.3 × 100	4.8 × 101 ± 2.8 × 100	4.8 × 101 ± 3.2 × 100	7.0 × 101 ± 5.8 × 100
W2 Inf	1.7 × 106 ± 1.6 × 103	5.2 × 104 ± 3.8 × 103	2.5 × 103 ± 1.2 × 103	2.5 × 103 ± 1.3 × 103	1.2 × 104 ± 1.3 × 103	1.5 × 103 ± 1.1 × 103	1.8 × 103 ± 1.4 × 102	1.2 × 103 ± 2.5 × 102	NDd
W2 Eff	1.0 × 104 ± 0.9 × 102	6.6 × 102 ± 5.7 × 101	2.2 × 102 ± 8.0 × 100	2.2 × 102 ± 8.0 × 100	3.1 × 101 ± 1.0 × 100	3.2 × 102 ± 1.5 × 101	3.2 × 102 ± 1.8 × 102	1.2 × 102 ± 5.9 × 100	8.9 × 102 ± 2.8 × 101
Calf F	NAe	6.1 × 107 ± 6.2 × 104	3.7 × 107 ± 1.2 × 105	3.7 × 106 ± 1.1 × 105	1.9 × 107 ± 1.2 × 106	3.7 × 106 ± 2.4 × 103	3.2 × 106 ± 2.4 × 104	2.5 × 106 ± 3.8 × 104	NA
Cow F	NA	7.8 × 107 ± 4.1 × 104	9.6 × 105 ± 5.1 × 105	2.5 × 106 ± 5.2 × 105	3.6 × 106 ± 1.9 × 105	3.1 × 104 ± 1.9 × 103	6.7 × 104 ± 6.9 × 102	6.7 × 104 ± 8.2 × 102	NA
Manure	NA	6.5 × 107 ± 1.3 × 103	1.5 × 106 ± 7.8 × 105	9.5 × 105 ± 7.3 × 105	1.4 × 106 ± 4.9 × 104	2.4 × 105 ± 3.7 × 103	3.1 × 107 ± 5.8 × 105	1.7 × 107 ± 4.8 × 105	NA

^aAll solid samples were from calf feces (Calf F), cow feces (Cow F), or manure, and the liquid waste samples were from the facultative pond (Pond), the raw pond (Raw), wetland 1 effluent (W1 Eff), wetland 1 influent (W1 Inf), wetland 2 effluent (W2 Eff), and wetland 2 influent (W2 Inf).

^bTotal E. coli numbers from different samples determined on SMAC medium.

^cTotal E. coli O157 numbers determined on CT-SMAC medium.

^dND, not determined.

^eNA, samples not collected for analysis.