TABLE 2.
Primers used in this study.
| Group | Serotype | Targeted gene | Froward primer (5′–3′) | Reverse primer (5′–3′) | Amplicon size (bp) |
| 1 | O1 | wzy | ATTTTCTGAACGAGGTCTTGATA | AAGATAAGTGGTTAGCACGAGG | 211 |
| O3 | wzy | TGATGGCTATTCTGCTCTGG | TTCCCAACCACCGTAGCC | 311 | |
| O4 | wzy | TGCTCCTGCTGAAGGTGTC | ATGGCAGTTCCTATTATTCCG | 411 | |
| O5 | wzy | AGTTTCGTTTGCTTGGCTC | TTCTCCCACGGTCCTCTGT | 523 | |
| O6 | wzy | TATGAAAACAATCGGTTACGC | GCCAATCTATACCAACCAACAT | 657 | |
| O7 | wzy | CTGTTCGTCTTCTTGTTAATCGT | CAAATAATCTAATGTGTATCCCCTG | 714 | |
| O8 | wzy | ATCTCCCTGTATTACTTTTATTTAGC | GCTGAGGTAATTAGAGGTCTAACAG | 850 | |
| O9/O10/O11 | wzy | AGCGTTTATATATTTCCTGCTTACT | GCTATCCCATTAGACACGCT | 1008 | |
| 2 | O12 | wzy | TATGCCTGTATGTTGTCTTTGC | TAACTAATACCAAAAAGCGGC | 400 |
| O13 | wzy | CTATCGCAGGTTTTAGACCCA | AAAGGTATTGTTAAAAATCCGAAT | 841 | |
| O14 | wzy | GTCACTTTATTTTGTTGGTTTGG | GTTCCGTGATCGTTAAGACAA | 215 | |
| O15 | wzy | TTTTGGCAGGAAGTCGTAAG | CGCTCTACCAAAGAAATTCAG | 308 | |
| O16 | wzy | GTGCTTTGCGATAATACCTGA | ACCCGCAGTAACATAGACATAAA | 475 | |
| O17 | wzy | ATGGCTTTCTCGTTTAGTTCG | GACTTCCCCACCACTCAACT | 651 | |
| O18 | wzy | TTCTGGCTGTGATGTTTTCG | CAGCGTTAAATCCAATCAAGAC | 1137 | |
| O19 | wzy | TGGATACAGGGTATTCCGCTA | AATCGCAAACTCATTGAAGAAG | 738 | |
| 3 | O20 | wzy | AACGACGCTATGTTTCTTTTG | CCGAACCACATAACCACAAA | 537 |
| O21 | wzy | CATTTATTCCATTTTTAAGCTCTG | CGCATAAACTTTCTCCCGA | 938 | |
| O22 | wzy | GAGATTCGGAAACGGACTTG | TATATCACAATGTTTATCACTGCC | 342 | |
| O23 | wzt | GGCTCCATTTCTTGTCTGCT | TATCCGAGTCAAGATGAGCAC | 241 | |
| O24 | wzy | TATTTGTATGCGTGCCAGAAG | ACTCAGATAGTATATTACCCGCAA | 441 | |
| O26 | wzy | GCATCGGTCAATCCTCAAG | ACAAGCCAGCACATCCAAC | 206 | |
| O27 | wzy | ATGGTTTACCGATGTCTACTGG | TTATACACCTTTTAATCGCCTATTA | 832 | |
| O30 | wzy | GTAATTGATGGTTTATGGCGTT | AGTGAGCAAAGGAATGAGAAAGT | 722 |