Blood poisonings at slaughter and their consequences

Area of Science:

• Veterinary Microbiology
• Food Safety
• Bacteriology

Background:

• Bacterial contamination in pork production poses risks to food safety and animal health.
• Understanding pathogen transmission routes and host defense mechanisms is crucial for effective control strategies.

Purpose of the Study:

• To investigate the contamination routes of pig blood by Enterococcus faecium and Pseudomonas fluorescens.
• To determine the distribution of these bacteria in organs and muscles post-contamination.
• To evaluate the bactericidal activity of pig blood and plasma against these specific bacteria.

Main Methods:

• Simulated contamination of pig blood via a bleeding knife and intravenous injection.
• Bacterial enumeration in various organs and muscle tissues.
• In vitro assessment of bactericidal activity in whole blood and plasma.

Main Results:

• Both Enterococcus faecium and Pseudomonas fluorescens contaminated pig blood through simulated bleeding and injection.
• Organs showed higher bacterial contamination levels than muscles.
• Following intravenous injection, only Enterococcus faecium was consistently re-isolated from organs and muscles.
• Pig blood and plasma demonstrated significant antimicrobial activity against Pseudomonas fluorescens and moderate activity against Enterococcus faecium.

Conclusions:

• Contamination of pig blood can occur through both external and internal routes.
• The distribution of bacteria varies between organs and muscles.
• Pig blood possesses inherent antimicrobial properties that influence bacterial persistence.
• These findings highlight the importance of hygiene in pork processing and provide insights into host-pathogen interactions.