Table 1

Data summary for all samples and lots

FecalHideCarcass
PreeviscerationPosteviscerationPostprocessing
Total samples91/32738/355148/34159/3326/330
Percent positive27.8 (23.0–33.0)10.7 (7.7–14.4)43.4 (38.1–48.8)17.8 (13.8–22.3)1.8 (0.7–3.9)
Lots sampled21/2911/29 26/30 17/30 5/30 
Percent lots positive72.4 (52.5–86.6)37.9 (20.7–57.7)86.7 (69.3–96.2)56.7 (37.4–74.5)16.7 (5.6–34.7)
Mean positive/lot, %26.2 (15.9–36.5)13.0 (3.5–22.5)43.4 (31.5–55.3)18.3 (10.3–26.3)1.9 (0.2–3.7)
Range, %0–1000–890–1000–780–22
  • Values are number of samples positive for EHEC O157/total samples taken and percent positive (95% confidence interval).