Performance of multiple diagnostic tools in assessing the progression of respiratory disease in calves infected with IBR followed by Mannheimia haemolytica

This study objective was to evaluate the performance and applicability of multiple diagnostic tools measuring physiological, clinical, and pathological changes as indicators of early bovine respiratory disease (BRD) in calves experimentally inoculated with infectious bovine rhinotracheitis virus (IBR) and Mannheimia haemolytica (Mh).