Tetanus is caused by the neurotoxin tetanospasmin, produced by the growth of Clostridium tetani in anaerobic conditions. Highly resistant spores are found in the soil; organisms can be routinely isolated from faeces of cats and dogs, but toxin produced in the gut is destroyed by digestion.
Dogs, and even more so cats, are relatively resistant to tetanus. Feline tetanus is a rare disease. Toxin produced in a wound travels up nerves, and gradually involves the whole CNS.
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