seroprevalence
noun
se·ro·prev·a·lence
ˌsir-ō-ˈpre-və-lən(t)s
-ˈprev-lən(t)s
: the frequency of individuals in a population who have a particular element and especially antibodies to an infectious agent in their blood serum
Cases of the illness increased 9-fold in the US between 2000 and 2008, and the national seroprevalence is estimated to be 3.1%.—The Journal of the American Medical Association
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