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Measures of disease frequency (view source)

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==Prevalence==

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The prevalence of a disease is the proportion of animals in the population of interest which are 'diseased' at any specific point in time. This may be a single point (in which case, the measure is the '''point prevalence'''), or may be over a period (in which case the '''period prevalence''' is given). However, it is important to realise that this measure will therefore include both old and new cases of disease. The prevalence can be viewed at an individual animal level as the 'probability that an animal selected at random from the population will be diseased'.

==Incidence==

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