Table 1. Distribution of polymerase chain reaction results from bovine Escherichia coli O157 isolates based on geographic origina.
| Country of origin | No. tested | Q allele | ||
|---|---|---|---|---|
| 933 | 21 | Both | ||
| N (%) | N (%) | N (%) | ||
| USA | 46 | 20 (44) | 25 (54) | 1 (2) |
| Scotland | 8 | – (0) | 2 (25) | 6 (75) |
| Australia | 7 | – (0) | 7 (100) | – (0) |
| Japan | 17 | 3 (18) | 14 (82) | – (0) |
| Total | 78 | 23 (29) | 48 (62) | 7 (9) |
a–, not detected. Percentages are read across rows, not down columns. Significant difference in proportion of Q alleles isolated from different countries (p < 0.05, chi-square test for homogeneity).