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Risk-based surveillance
These calculators can be used for the simple analysis of risk-based surveillance. They are simplified versions of the scenario-tree modelling tools for the analysis of complex surveillance systems to demonstration freedom from disease or for the early detection of disease (available at https://www.ausvet.com.au/tools-resources/). These calculators use simple common surveillance system structures that allow the calculation of the sensitivity of a risk-based or biased surveillance system, and the calculation of the required sample size to achieve a target sensitivity.
Click here for some important formulae for freedom analyses.
1-stage survey with single risk factor
Population sensitivity and confidence of freedom
2-stage survey with single risk factor at cluster level
Sample size
Population sensitivity and confidence of freedom
2-stage survey with risk factors at both cluster and unit levels
Sample size
Population sensitivity and confidence of freedom
- For two levels of unit sensitivity independent of risk group
- For unit sensitivity varying between risk groups
- For actual cluster testing data and unit sensitivity can vary between risk groups
- "EuFMD Model": For herd-level data, herd- and animal-level risk factors and multiple surveillance components