TABLE 2.
Detection of coliforms and E. coli in water samples collected in association with waterborne outbreak 2
| Sampling site | No. of coliforms (CFU/100 ml)
|
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| June 13 | Aug. 7 | Aug. 9 | Aug. 13 | Aug. 20 | Aug. 27 | Aug. 28 | Aug. 30 | Aug. 31 | Sept. 3 | |
| Lake water | NDa | ND | ND | ND | ND | 28 | ND | ND | ND | ND |
| Raw water | ND | 21 | 5 | 2 | 13 | 5 | 2 | 2 | 9 | 1 |
| Outlet water after treatment | <1 | 31 | 9 | 4 | 21 | 195b | 168b | <1 | 1 | <1 |
| Tap water, point 1 | ND | 4 | ND | 3 | 15 | 5c | ND | <1 | <1 | <1 |
| Tap water, point 2 | ND | ND | ND | ND | ND | 171 | ND | 16 | <1 | <1 |
a
ND, not done.
b
None of the colonies studied was confirmed to be E. coli.
c
The volume studied was 5,000 ml, and all five colonies were confirmed to be E. coli.