Table 3.
PCR-MS identifications for diarrheagenic E. coli isolates
| Serotype(s) (na) | No. of isolates analyzed | PCR-MS IDb |
|---|---|---|
| O157:H7 (66) | 66 | O157:H7 (and O55:H7) |
| O157:H unknown (46) | 45 | O157:H7 (and O55:H7) |
| 1 | Unidentified | |
| O55:H7 (7) | 7 | O55:H7 (and O157:H7) |
| O45:H2 or O45:HND (5) | 5 | O45:H2 (and O103, O111, O121) |
| O26:H11 or O26:HND (32) | 11 | Shigella spp., O111 |
| 10 | O26:H2 and O26:H11 | |
| 6 | O26:H11 and O111 | |
| 4 | Others | |
| 1 | Unidentified | |
| O103:H2, O103:H6, O103:H(25) (11) | 6 | O103 (and O45, O111, O139, O128, O91) |
| 4 | O103, O45 | |
| 1 | O104:H21 | |
| O104:H4 (1) | 1 | O111/EAEC and Shigella spp. |
| O111:H8, O111:H11, O111:HNM (47) | 17 | O26:H2 and O26:H11 |
| 8 | O103 | |
| 8 | O111 (and O26, O103) | |
| 5 | O113:H21 | |
| 5 | O111:H8, S. flexneri | |
| 4 | O45 | |
| O113:H21 (1) | 1 | O113:H21 |
| O118:H16 (1) | 1 | O26:H2 and O26:H11 |
| O121:H19, O121:HND (5) | 1 | O121 (and O45, O143) |
| 1 | O26:H2 and O26:H11 | |
| 1 | O157:not H7 | |
| 2 | E. coli (serotype unknown) | |
| O143:H4 (1) | 1 | O138 |
| O145:H(25), O145:HND (6) | 3 | O157:H7 |
| 1 | O145:HND | |
| 1 | O111 | |
| 1 | E. coli (serotype unknown) |
a
n, total no. of isolates analyzed.
b
Bold results indicate PCR-MS identification (ID) was concordant with serology at the serogroup level (O antigen).