| prevalence | <statistics> The proportion of individuals in a population having a disease. (05 Mar 1998) |
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| prevalence index | <statistics> A weighted average measure of the sum of the frequency of occurrences of all species along a single transect or as calculated for a plant community by averaging the prevalence index of all sample transects through the community. (05 Mar 1998) |
| prevalence models | <epidemiology> Prevalence models are compartmental models dividing the host population into, for example, susceptible, latent, infectious and immune individuals. (05 Dec 1998) |