There are about a dozen antimicrobial agents (AMA) and an equal number of bacterial types or species which are resistant to one or the other afore said antimicrobial agent or antibiotic. A list of these antimicrobial agents or antibiotics and corresponding resistant bacteria has been cited in the table-1 below. Antimicrobial susceptibility testing (AMST) against these antimicrobial agents or antibiotics with reference to corresponding bacteria could be discontinued to save time and money.
Table-1: Antimicrobial agents or antibiotics and resistant bacteria
| Antimicrobial agent | Resistant Bacteria |
| Aminoglycosides | Anaerobic bacteria, Enterococci and Streptococci |
| Ampicillin | Klebsiella species |
| Aztreonam | Gram-positive bacteria |
| Vancomycin | Gram-negative bacteria |
| Sulphonamides, trimethoprim | Proteus aeruginosa |
| Tetracycline, chloramphenicol | P. aeruginosa |
| All cephalosporins | Enterococci |
| Aminoglycosides | Enterococci |
| Imipenem | Stenotrophomonas maltophilia |
| Metronidazole | Aerobic bacteria |
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