SUPURATIVE BRONCHOPNEUMONIA IN A DUTCH HEIFER: A CASE REPORT WITH MORPHOLOGICAL CONSISTENCY WITH PASTEURELLOSIS

• DOI: https://doi.org/10.22533/at.ed.51572826020412

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• Abstract:

  Bovine Respiratory Disease Complex (BRDC), also known as enzootic pneumonia, is an emerging infectious disease that occurs in young cattle [1,3]. It is caused by a set of etiological agents, the most important of which is bovine respiratory syncytial virus (BRSV). Among the most significant opportunistic bacterial agents are Pasteurella multocida, Mannheimia haemolytica, Trueperella pyogenes, Histophilus somni, and Mycoplasma bovis, often in co-infections [3]. CDRB is a multifactorial syndrome triggered by the interaction between stressors (weaning, stocking density, environment), failures in the transfer of passive immunity, and primary viral infections that compromise mucociliary clearance. It is of high sanitary and economic relevance in dairy systems, with high morbidity and mortality in heifers during the weaning period [2]. During the rainy season, cases of pneumonia increase due to the animal’s weakened condition [5]. Macroscopically, bacterial bronchopneumonia presents with cranio-ventral consolidation, purulent exudate, and, in later cases, foci of necrosis and parenchymal abscesses [3,8]. Necropsy, supported by culture/PCR and histopathology when available, is crucial for etiological confirmation and for guiding management and prevention measures in the herd [8]. The objective of this study is to describe a fatal case of suppurative bronchopneumonia in a weaned Holstein heifer, with extensive cranio-ventral consolidation, necrosis, and pulmonary abscesses, highly consistent with pasteurellosis.