|Many thanks March 2014 donors; special to Darren Duncan. April 2014 donations open; need minimum total $100. Let's exceed that.
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From Citizendium, the Citizens' Compendium
Prevalence is the "total number of cases of a given disease in a specified population at a designated time. It is differentiated from incidence, which refers to the number of new cases in the population at a given time."