TABLE 5.
Percentage (No.) of Mannheimia haemolytica and Pasteurella multocida isolates from bovine respiratory disease mortalities that are multidrug resistant by number of antimicrobial treatments the animal received.
| Percentage of isolates (no. isolates) with drug count of multidrug resistance profile |
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| Species | Treatment No. | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 15 | 16 |
| M. haemolytica | None | 4 (2) | 15 (7) | 19 (9) | 15 (7) | 17 (8) | 2 (1) | 2 (1) | 8 (4) | 13 (6) | – | – | – | 6 (3) |
| First | 3 (2) | 7 (4) | 9 (5) | 5 (3) | 52 (30) | 10 (6) | 2 (1) | 5 (3) | 3 (2) | – | 2 (1) | 2 (1) | – | |
| Second | 8 (2) | 12 (3) | 8 (2) | – | 36 (9) | 12 (3) | 12 (3) | 4 (1) | 4 (1) | – | – | 4 (1) | – | |
| Third | – | 18 (2) | – | – | 18 (2) | 9 (1) | 9 (1) | – | – | 9 (1) | 9 (1) | 27 (3) | – | |
| Fourth | – | 25 (1) | – | 50 (2) | 25 (1) | – | – | – | – | – | – | – | – | |
| Fifth | 100 (1) | – | – | – | – | – | – | – | – | – | – | – | – | |
| P. multocida | None | – | 4 (1) | 4 (1) | 4 (1) | 13 (3) | 21 (5) | 25 (6) | 17 (4) | 8 (2) | 4 (1) | – | ||
| First | – | 7 (1) | 7 (1) | – | – | 7 (1) | 27 (4) | 33 (5) | 7 (1) | 13 (2) | – | |||
| Second | 25 (2) | – | 13 (1) | – | – | – | 13 (1) | 38 (3) | – | – | 13 (1) | |||
| Third | – | – | – | – | – | – | 20 (1) | 40 (2) | – | – | 40 (2) | |||
| Fourth | 11 (1) | – | – | – | – | – | 11 (1) | 56 (5) | 22 (2) | – | – | |||
| Fifth | – | – | – | – | – | – | 43 (3) | 43 (3) | 14 (1) | – | – | |||
| Sixth | – | – | – | – | – | – | – | 50 (1) | 50 (1) | – | – | |||