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Enrichment tubes positive for the presence of E. coli O157 (>10,000 ECL units)
| Sample | No. of tubes positive for O157/total no. of tubes
|
|
|---|---|---|
| ECBa | MLBb | |
| Unspiked water | 0/9 | 0/9 |
| Spiked water | 1/3, 2/3c | 2/3, 3/3c |
| Concentrated water (100-fold) | 9/9 | 9/9 |
All tubes were turbid regardless of the presence of E. coli O157.
Turbidity was directly correlated with presence of E. coli O157.
Number of positive tubes for water samples 2 and 3; the positivity for sample 1 was not determined.
