|Many thanks January-February donors; special to Darren Duncan. March donations open; need minimum total $100. Let's exceed that.
Donate here. Donating gifts yourself and CZ.
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."