TABLE 3.
Results from detection of E. coli on coupons by FISH (with or without resuscitation) and culture-based (MPN or membrane filtration) or enzyme-based (Colilert or Colisure; IDEXX, Ltd.) analysis after exposure to drinking water in France and Latvia for 1 to 6 monthsa
| Site | Coupon material | FISH | Culture or enzymatic method |
|---|---|---|---|
| A1 | CI | - | ND |
| PVC | - | - | |
| A2 | CI | - | ND |
| PVC | - | ND | |
| PVC | - | - | |
| A3 | CI | - | ND |
| PVC | - | ND | |
| PVC | - | - | |
| D1 | CI | + | - |
| D2 | CI | + | - |
| PVC | + | ND | |
| PVC | + | - | |
| D3 | CI | + | - |
| PVC | + | - | |
| CI | + | ND | |
| PVC | + | ND | |
| M1 | CI | + | ND |
| CI | - | ND | |
| PVC | - | - | |
| PVC | - | - | |
| PVC | - | - | |
| M2 | CI | + | - |
| CI | - | - | |
| CI | - | - | |
| PVC | + | ND | |
| T1 | CI | - | ND |
| PVC | + | - | |
| CI | + | - | |
| PVC | + | ND | |
| CI | - | ND | |
| T2 | CI | + | ND |
| CI | + | - | |
| PVC | + | - | |
| R1 | SS | - | - |
| SS | + | - | |
| SS | + | ND | |
| SS | - | ND | |
| B1 | SS | + | - |
| B2 | SS | + | - |
| B3 | SS | + | - |
| SS | + | - | |
| SS | + | - | |
| C1 | SS | + | ND |
a
+, Positive; −, negative; ND, not determined; CI, cast iron; SS, stainless steel.