Bovine Hemorrhagic Bowel Syndrome Study Guide
Overview and Clinical Importance
Hemorrhagic Bowel Syndrome (HBS), also known as Jejunal Hemorrhage Syndrome (JHS), is a sporadic, acute, and often fatal intestinal disease primarily affecting adult dairy cattle. First described in 1991, HBS is characterized by segmental necrohemorrhagic enteritis of the small intestine, predominantly the jejunum, leading to intramural hematoma formation and luminal obstruction.
The syndrome has emerged as an economically significant disease in North American and European dairy herds, with case fatality rates reported between 85-100%. Affected animals typically die within 12 to 48 hours after onset of clinical signs. While the exact etiology remains unclear, Clostridium perfringens type A and Aspergillus fumigatus have been implicated as potential causative agents.
Etiology and Pathophysiology
Proposed Etiologic Agents
The exact cause of HBS remains uncertain and is believed to be multifactorial. Two primary organisms have been implicated:
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