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| Serotypes | APEC isolates (n = 65) | Clinical infected samples (n = 20) | ||
| PCR | Serum agglutination | PCR | Serum agglutination | |
| O1 | 9 | 8 | 2 | 2 |
| O2 | 11 | 10 | 3 | 3 |
| O18 | 6 | 6 | 2 | 2 |
| O78 | 39 | 36 | 10 | 9 |
| O1/O2/O18/O78 | 0 | 5 | 0 | 1 |
