[Model calculation to explain the BSE-incidence in Germany].

Area of Science:

• Veterinary epidemiology
• Infectious disease modeling
• Food safety science

Background:

• Bovine spongiform encephalopathy (BSE) poses a significant public health risk.
• Understanding transmission dynamics is crucial for effective control strategies.
• Previous BSE outbreaks highlight the importance of international trade in disease spread.

Purpose of the Study:

• To investigate the future development of BSE incidence in Germany.
• To analyze the impact of transmission risks and control measures.
• To quantify the recycling rate of BSE-infected material.

Main Methods:

• Utilized a simple epidemiological model.
• Incorporated data from Great Britain's BSE incidence since 1988.
• Analyzed German BSE incidence data from post-mortem testing of cattle (>24 months).
• Characterized transmission risk using the reproduction ratio.

Main Results:

• The decrease in German BSE incidence (2001-2003) was attributed to imported contaminated feed from 1995/96, not late 2000 containment measures.
• A time lag exists between BSE transmission risk and incidence due to a >4-year incubation period.
• Continued active surveillance is essential for future modeling.

Conclusions:

• The observed decline in BSE cases in Germany was linked to historical feed contamination.
• Epidemiological modeling can provide insights into past disease dynamics.
• Ongoing surveillance is vital for predicting and managing future BSE risks.