TABLE 2.
Highest-pathogenicity E. coli class shed by individual cowsa
| Farm | % of cows (% of all fecal samples) by E. coli pathogenicity classb: |
No. of cows (no. of fecal samples) | ||||
|---|---|---|---|---|---|---|
| NLNS | LNS | STEC | p-EHEC | p-O157 | ||
| A | 2.3 (21.0) | 6.9 (33.8) | 26.6 (26.0) | 55.0 (17.8) | 9.2 (1.4) | 1,037 (4,522) |
| B | 0.0 (12.4) | 1.0 (21.4) | 13.4 (40.4) | 67.7 (24.0) | 17.9 (1.8) | 403 (2,587) |
| C | 0.7 (12.7) | 2.8 (28.0) | 21.2 (25.9) | 64.6 (31.2) | 10.6 (2.3) | 424 (1,548) |
a
E. coli classes were ranked from lowest potential pathogenicity (“non-LEE non-stx” E. coli [NLNS]) to highest (p-O157), from left to right. Individual cows were classified according to the highest potential pathogenicity class observed among their fecal samples; e.g., if the highest-pathogenicity sample from a cow was classified as p-EHEC, that cow was counted in the p-EHEC class.
b
Values in parentheses represent the percentage of all fecal samples classified in each E. coli pathogenic class (see also Fig. 2, as well as Table S2 in the supplemental material).