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Most frequent antimicrobial pairings as reported within OSVS records (July 1, 2007 – June 30, 2009)
| Combination | Number of records (N = 676) |
|---|---|
| Penicillin + tetracycline |
24 |
| Penicillin + ceftiofur |
16 |
| Penicillin + sulfonamide |
13 |
| Sulfonamide + tetracycline |
9 |
| Neomycin + tetracycline |
8 |
| Tulathromycin + ceftiofur |
8 |
| Sulfonamide + trimethoprim |
8 |
| Penicillin + sulfonamide + tetracycline | 7 |
