Table 1.
Information regarding cattle from which Mannheimia haemolytica (M. haemolytica) was isolated from nasopharyngeal swabs (NPS), the number of AMR phenotypes (antibiograms) of M. haemolytica identified among all isolates, and the genotype of M. haemolytica isolated based on MALDI-TOF MS.
| Animal ID | Housing group | Clinical signs of BRD when sampled | Antimicrobials received before sampling (days before) | Number of AMR phenotypes | Genotype |
|---|---|---|---|---|---|
| 205 | A | no | none | 1 | 1 |
| 232 | A | no | none | 1 | 1 |
| 260 | A | no | none | 3 | 2 |
| 277 | A | no | none | 2 | 2 |
| 256 | A | no | none | 1 | 1 |
| 262 | A | no | none | 1 | 2 |
| 56–8 | B | yes | CEF (34) TUL (19) FLO (9) |
2 | 2 |
| 53–49 | C | yes | CEF (8) | 2 | 2 |
| 49–16 | D | yes | CEF (35) TUL (15) FLO (12) |
1 | 2 |
| 54–8 | D | yes | CEF (21) TUL (3) |
1 | 2 |
| 54–211 | D | yes | CEF (14) TUL (7) |
1 | 2 |
Cattle in the same housing group were housed and managed together. Although multiple phenotypes of M. haemolytica were isolated from some cattle, all isolates identified from each animal were a single genotype, either genotype 1 or genotype 2. Antimicrobials: CEF, ceftiofur, TUL, tulathromycin, FLO, florfenicol.