The Swiss control programme for Salmonella enteritidis in laying hens: experiences and problems

Area of Science:

• Veterinary Public Health
• Food Safety
• Epidemiology

Background:

• Salmonella Enteritidis (S. Enteritidis) poses a significant public health risk.
• Poultry production is a primary reservoir for S. Enteritidis transmission.
• Controlling S. Enteritidis in poultry is crucial for preventing human infections.

Purpose of the Study:

• To evaluate the effectiveness of the Swiss national control program for Salmonella Enteritidis.
• To assess the impact of control measures on S. Enteritidis prevalence in poultry and human infections.
• To identify key strategies for eliminating S. Enteritidis from poultry farms.

Main Methods:

• Implementation of a national control program starting in 1993.
• Focus on eliminating infected parent and layer flocks.
• Enforcement of new Zoonosis Order and stringent import regulations.
• Voluntary monitoring, enhanced biosecurity, and use of heat-treated feed.
• Targeted interventions for contaminated free-range farms.

Main Results:

• Significant reduction in reported human S. Enteritidis infections.
• Human infection rates approaching pre-outbreak levels (1988).
• Successful identification and removal of S. Enteritidis-positive flocks.
• Prevention of S. Enteritidis spread through comprehensive farm-level measures.

Conclusions:

• The Swiss control program has been highly effective in reducing S. Enteritidis.
• Integrated strategies targeting poultry flocks and farm hygiene are crucial.
• Continued vigilance and elimination efforts are necessary to maintain low infection rates.