NAVLE Nervous

Bovine Tetanus Study Guide

Tetanus is an acute, often fatal neurologic disease caused by the neurotoxin tetanospasmin produced by Clostridium tetani, a gram-positive, spore-forming, obligate anaerobic bacterium.

Overview and Clinical Importance

Tetanus is an acute, often fatal neurologic disease caused by the neurotoxin tetanospasmin produced by Clostridium tetani, a gram-positive, spore-forming, obligate anaerobic bacterium. While cattle are relatively more resistant to tetanus toxin compared to horses and sheep, the disease remains an important differential diagnosis in bovine practice and can cause significant losses during outbreaks associated with management procedures.

The disease is characterized by spastic paralysis resulting from the toxin's blockade of inhibitory neurotransmitter release in the central nervous system. Understanding the pathophysiology, clinical presentation, and management of tetanus is essential for veterinary practice and is a high-yield topic for the NAVLE examination.

Toxin Function and Significance
Tetanospasmin (TeNT) Primary neurotoxin responsible for ALL clinical signs 151 kDa protein with heavy chain (100 kDa) and light chain (50 kDa) One of the most potent toxins known (minimum lethal dose: 2.5 ng/kg) Encoded on a plasmid present in all toxigenic strains
Tetanolysin Hemolysin that causes local tissue necrosis Contributes to anaerobic conditions favorable for bacterial growth Role in pathogenesis is not fully understood

Etiology

Causative Agent

Clostridium tetani is a gram-positive, spore-forming, obligate anaerobic rod bacterium. Key characteristics include:

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