| Primer name | Primer sequences 5'-3' | Denaturation (˚C/sec) | Annealing (˚C/sec) | Elongation (˚C/sec) | Cycle | PCR products |
| CTX-M-1 group | F-GCTGTTGTTAGGAAGTGTGC | 94/60 | 55/60 | 72/90 | 30 | 516 |
| R-CCATTGCCCGAGGTGAAG | ||||||
| CTX-M-2 group (*) | F-ACGCTACCCCTGCTATTT | 94/60 | 55/60 | 72/90 | 30 | 779 or 780 |
| R-CCTTTCCGCCTTCTGCTC | ||||||
| CTX-M-9 group (**) | F-GCAGATAATACGCAGGTG | 94/60 | 55/60 | 72/90 | 30 | 393 |
| R-CGGCGTGGTGGTGTCTCT | ||||||
| TEM group (***) | F-CCGTGTCGCCCTTATTCC | 94/60 | 55/60 | 72/90 | 30 | 824 |
| R-AGGCACCTATCTCAGCGA | ||||||
| SHV group (****) | F-ATTTGTCGCTTCTTTACTCGC | 94/60 | 55/60 | 72/90 | 30 | 1051 |
| R-TTTATGGCGTTACCTTTGACC | ||||||
| ampC | F-GGGGCGGTTTCTCATGCAGCCAACG | 94/60 | 55/60 | 72/90 | 30 | 1313 |
| R-GAAGCGCTCATGGCACCATCATAGCC | ||||||
| (*) only in A-12 | 95/30 | 63/30 | 72/60 | |||
| (**) only in D-18 | 94/60 | 58/60 | 72/120 | 35 | ||
| (***) only in A-12 | 95/30 | 63/30 | 72/60 | |||
| (***) only in D-18 | 95/30 | 61/30 | 72/60 | |||
| (****) only in A-12 | 95/30 | 63/30 | 72/60 |