Bovine Actinomycosis Study Guide
Overview and Clinical Importance
Actinomycosis, commonly known as "lumpy jaw" or "big jaw", is a chronic, progressive, pyogranulomatous infection primarily affecting the bony tissues of the head in cattle. The disease is caused by Actinomyces bovis, a gram-positive, anaerobic, filamentous bacterium that is part of the normal oral microbiota of ruminants. This condition represents a significant cause of economic loss in cattle production due to reduced feed intake, weight loss, and condemnation at slaughter.
The disease was first described by Bollinger and Harz in 1877 and remains an important differential diagnosis for facial swellings in cattle. Understanding actinomycosis is essential for NAVLE preparation as it tests knowledge of infectious disease pathophysiology, diagnostic approach, and treatment protocols in food animal medicine.
Etiology
Causative Agent
Actinomyces bovis is the primary causative agent of bovine actinomycosis. Key microbiological characteristics include:
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