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In Canada, Salmonella causes an estimated 88,000+ cases of human foodborne illness every year, creating a significant economic burden across the healthcare and agricultural sectors. Because pork is a key vector, maintaining on-farm control is critical for both public health and farm profitability.
Salmonellosis can be caused by more than 2,000 Salmonella serotypes, though Salmonella Typhimurium and its monophasic variants are most prevalent in Canadian swine operations. In pigs, infection typically manifests as intestinal inflammation (enteritis) or blood poisoning (septicemia), though many animals remain asymptomatic carriers that shed the bacteria.
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Salmonella is not just a single disease but a group of infections caused by different strains of the Salmonella bacteria. There are currently more then 2700 strains of salmonella bacteria known. In pigs, the most commonly encountered strains include Salmonella Derby and Salmonella Typhimurium.
A study in 25 EU member states plus Norway has shown that S. Typhimurium (40% in lymph nodes, 49% in carcasses) and S. Derby (15% in lymph nodes, 24% in carcasses) are the two most common serovars in Salmonella positive slaughter pigs. While Salmonella Derby is host-adapted to pigs and tends to cause more severe outbreaks, Salmonella Typhimurium is not host-specific and can infect a range of animals, including humans.
The severity of Salmonella infections in pigs can vary, and it often depends on factors such as the specific strain of Salmonella, the age and health status of the pigs, and the overall management practices on the farm.
The transmission of Salmonella to pigs can occur through various routes.
There are host specific and non-host specific salmonella strains. The latter can be spread from humans to animals and vice versa.
Salmonella spreads through:
Understanding these transmission pathways is crucial for implementing effective biosecurity measures to protect your herd.
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The symptoms of Salmonella infection in pigs can vary, but commonly include:
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Good biosecurity is the most important defence pig farmers have to prevent and manage salmonella infection on their pig farms.
Implementing clear hygiene protocols and robus biosecurity measures for visitors, vehicles, feed and goods entering the farm are important to prevent the introdcution of new strains and to lower pathogen pressure on the animals. Safeguard the health of your animals and you livelihood by taking steps to protect your farm.
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