TABLE 1.
Detection of coliforms, E. coli, and C. jejuni in water samples collected either from a groundwater source or tap water in waterborne outbreak 1
| Sampling site | Detection of bacteria (CFU)
|
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Coliformsa
|
E. colib
|
C. jejunic
|
||||||||
| Aug. 10 | Aug. 14 | Aug. 30 | Sept. 6 | Aug. 10 | Aug. 14 | Aug. 30 | Sept. 6 | Aug. 10 | Aug. 14 | |
| Groundwater source 1 (two wells) | − (100)d | − (100) | 1 (1,000) | 1 (1,000) | − (100) | − (100) | 1 (1,000) | − (1,000) | NDe | − (10,000) |
| Groundwater source 2 (two wells) | − (100) | − (100) | − (1,000) | − (1,000) | − (100) | − (100) | − (1,000) | − (1,000) | ND | − (10,000) |
| Sampling point 1, tap | − (100) | − (100) | ND | ND | − (100) | − (100) | ND | ND | + (4,000) | ND |
| Sampling point 2, tap | 1 (100) | − (100) | ND | ND | 1 (100) | − (100) | ND | ND | ND | ND |
a
Les Endo medium (100 or 1,000 ml) was used for the analysis.
b
The results were confirmed by using Les Endo medium and the API20E method.
c
The sample size was 4,000 or 10,000 ml.
d
−, not detected; +, detected; The values in parentheses are sample sizes (in milliliters).
e
ND, not done.