Table 4.
Comparison of Positive Results in the Urban (Laboratory A) vs Rural (Laboratory B) Laboratories, 2000–2006
| Agent | Urban | Rural | RR (95% CI) | P Value |
|---|---|---|---|---|
| No. (%) | No. (%) | |||
| Campylobacter | 356 (2.6%) | 316 (2.2%) | 1.2 (1.0–1.4) | .02 |
| Enterotoxigenic Escherichia coli | 256 (1.9%) | 116 (0.8%) | 2.3 (1.9–2.9) | <.001 |
| Salmonella | 151 (1.1%) | 150 (1.0%) | 1.1 (0.8–1.3) | NS |
| Shigella spp | 165 (1.2%) | 27 (0.2%) | 6.5 (4.3–10) | <.001 |
| Shigella sonnei | 147 (1.1%) | 23 (0.1%) | 6.8 (4.4–10) | <.001 |
| Shigella flexneri | 13 (0.1%) | 4 (<0.1%) | 3.4 (1.0–11) | .03 |
| Non-O157 Shiga toxin-producing E. coli | 65 (0.5%) | 63 (0.4%) | 1.1 (0.8–1.5) | NS |
| Shiga toxin-producing E. coli O157 | 30 (0.2%) | 73 (0.5%) | 0.4 (0.3–0.7) | <.001 |
| Total Stool Cultures | 13 802 | 14 578 |
Abbreviations: CI, confidence interval; NS, not significant; RR, relative risk.