Table 2. Comparison of prevalence of secretory immunoglobulin A to enterohemorrhagic Escherichia coli antigens in milk samples collected from women from Mexico and the United States.
| Antigen | Mexico (%) (N=73) | United States (%) (N=50) | p value |
|---|---|---|---|
| O26 |
58 (79) |
43 (86) |
NSa |
| O55 |
35 (48) |
16 (32) |
NS |
| O111 |
44 (60) |
31 (62) |
NS |
| O127 |
42 (58) |
19 (38) |
NS |
| O128 |
7 (10) |
20 (40) |
<0.0002 |
| O157 |
25 (34) |
18 (36) |
NS |
| Stx |
9 (12) |
11 (22) |
NS |
| EspA |
68 (93) |
45 (90) |
NS |
| EspB |
32 (44) |
14 (28) |
NS |
| Intimin (C281γ) | 20 (27) | 16 (32) | NS |
aNS, not significant by chi-square test.