Table 1. Summary of Antibiotic Inactivation Studies for Gram-positive Isolates.
| Antibiotic | Resistant Strains | Number of antibiotic Inactivation Strains | Mechanism of Inactivation |
| Apramycin | 7 | 0 | ------- |
| Gentamicin | 5 | 0 | ------- |
| Neomycin | 8 | 0 | ------- |
| Streptomycin | 8 | 0 | ------- |
| Tetracycline | 4 | 0 | ------- |
| Minocycline | 1 | 0 | ------- |
| Clindamycin | 6 | 0 | ------- |
| Chloramphenicol | 12 | 0 | ------- |
| Synercid | 2 | 0 | ------- |
| Erythromycin | 7 | 1 | Phosphorylation |
| Telithromycin | 4 | 4 | Phosphorylation Glycosylation |
| Linezolid | 2 | 0 | ------- |
| Novobiocin | 5 | 0 | ------- |
| Cephalexin | 17 | 5 | Hydrolysis |
| Ampicillin | 8 | 5 | Hydrolysis |
| Piperacillin | 9 | 2 | Hydrolysis |
| Daptomycin | 24 | 7 | Hydrolysis |
Strains were grown in 50% TSB for 5 days in presence of 20 µg/ml antibiotic. Conditional media was used for setting up disk diffusion assays and LC-MS analyses. Inactivation was defined as the absence of a zone of clearance around the disk. Hydrolytic mechanism of ß-lactam resistance is inferred.