Table 2.
Percent of samples positive for respiratory pathogens identified in 100 dairy calves diagnosed with bovine respiratory disease by clinical assessment and thoracic ultrasound, and sampled by nasal swab (NS), guarded nasopharyngeal swab (NPS), bronchoalveolar lavage (BAL), and transtracheal wash (TTW)
| Pathogen | NS | NPS | BAL | TTW |
|---|---|---|---|---|
| BCV | 15/96 (15.6%) | 19/91 (20.9%) | 13/91 (14.3%) | 6/91 (6.6%) |
| BRSV | 9/96 (9.4%) | 13/94 (13.8%) | 15/94 (16.0%) | 17/98 (17.4%) |
| M. haemolytica | 20/100 (20%) | 17/100 (17%) | 17/100 (17%) | 16/100 (16%) |
| P. multocida | 60/100 (60%) | 61/100 (61%) | 60/100 (60%) | 59/100 (59%) |
| Mycoplasma sp. | 88/92 (95.7%) | 85/95 (89.5%) | 87/88 (98.9%) | 87/92 (94.6%) |
| Mycoplasma bovis | 45/96 (46.9%) | 47/90 (52.2%) | 51/94 (54.3%) | 48/91 (52.7%) |
For some agents, the total number of samples is less than 100 because samples were not included if the laboratory reported them as contaminated or indeterminate. BCV, bovine coronavirus. BRSV, bovine respiratory syncytial virus.