Type C botulism in cattle being fed ensiled poultry litter

Area of Science:

• Veterinary Medicine
• Microbiology
• Food Safety

Background:

• Bovine botulism outbreaks pose significant risks to animal health and the food supply.
• Ensiled animal byproducts can be a source of microbial contamination.
• Characterization of botulinum toxin types is crucial for understanding disease transmission and pathogenesis.

Purpose of the Study:

• To identify and characterize the botulinum toxin responsible for a major bovine botulism outbreak.
• To investigate the presence and distribution of Clostridium botulinum in affected animals and potential sources.
• To assess the diagnostic and food safety implications of this outbreak.

Main Methods:

• Characterization of botulinum toxin isolated from ensiled poultry litter.
• Experimental feeding of affected litter to calves to observe clinical signs and toxin presence.
• Detection of botulinum toxin in serum and muscle tissues of affected animals.
• Microbiological analysis of feces and kidney tissues for Clostridium botulinum.

Main Results:

• The causative agent was identified as botulinum toxin type C1.
• Experimental calves developed transient ataxia and serum toxin following ingestion of contaminated litter.
• Type C1 toxin was detected in muscle tissue from an affected animal seven months post-mortem.
• Clostridium botulinum type C was identified in fecal and kidney samples from other affected animals.

Conclusions:

• Ensiled poultry litter can harbor and disseminate Clostridium botulinum type C1, leading to bovine botulism.
• The persistence of toxin in muscle tissue has implications for meat safety.
• Accurate diagnosis and management strategies are essential for controlling future outbreaks and mitigating risks.