surveillance objective demonstration of disease freedom A surveillance objective to gather evidence that can demonstrate, with a given confidence level, that a specific hazard is not present in a given population. This objective is appropriate if the target hazard is thought to be absent in the territory to be covered and the aim is to demonstrate disease freedom for trade or non−trade purposes (e.g. improve public health, to decide when to stop an eradication programme and to eliminate production losses and control costs due to endemic disease). This may apply to diseases which a) have been historically absent, b) have been eradicated and official freedom has been confirmed or c) are thought to be eradicated, but official freedom has not yet been confirmed. https://github.com/SVA-SE/AHSURED/wiki