Risk-based analysis of the Danish pork Salmonella program: past and future

Area of Science:

• Food safety
• Veterinary epidemiology
• Risk assessment

Background:

• The Danish pork Salmonella control program, initiated in 1993, aimed to reduce Salmonella prevalence in pork products.
• Significant investment and reductions in Salmonella cases were observed, prompting a review of program effectiveness.

Purpose of the Study:

• To analyze the effectiveness of the Danish pork Salmonella control program.
• To provide data-driven insights for future program development and optimization.

Main Methods:

• A computer simulation model using Excel workbooks was developed to represent farm-to-fork Salmonella risk.
• Modules included pig production, carcass contamination during slaughter, and pork-attributable human cases (PAHC).
• Parameter estimates were derived from an extensive Danish Zoonosis Centre database.

Main Results:

• Retrospective simulations (1994-2003) indicated minimal impact of on-farm programs on reducing positive carcasses and PAHC after initial years.
• Improvements in abattoir processes were the primary driver of PAHC reductions up to 2003.
• Prospective simulations (2004-2013) suggested on-farm programs alone yield minimal human health risk reduction.

Conclusions:

• On-farm Salmonella control measures in the Danish pork industry had limited effectiveness in reducing human cases.
• Carcass decontamination emerged as the most impactful intervention for reducing pork-attributable human cases.
• Future strategies should prioritize post-slaughter interventions for enhanced food safety.