Table 1. Fecal sources of E. coli isolates used in this study.
| Source | Collection site (all in Hong Kong) | # of samples | # of isolates |
|
|---|---|---|---|---|
| Collected | Tested | |||
| Sewage | Soil pipe, Hong Kong University of Science & Technology | 2 | 20 | 20 |
| Cow | Country park, Sai Kung | 6 | 20 | 20 |
| Dog | Pet shop, Tuen Mun | 4 | 20 | 19 |
| Pig | Farm, Yuen Long | 4 | 20 | 14 |
| Total | 73 | |||
Each sewage sample was collected on a different day, and each fecal sample was collected from a different individual. Originally, 20 isolates were collected from the samples of each source. But some isolates of the dogs’ and pigs’ samples lost their viability in the frozen stock. Therefore, fewer isolates were tested for those two sources.