parasitemia
noun
par·a·sit·emia
variants:
or chiefly British parasitaemia \ ˌpar-ə-ˌsī-ˈtē-mē-ə 
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Medical Definition of parasitemia
: a condition in which parasites are present in the blood
—used especially to indicate the presence of parasites without clinical symptoms
an afebrile parasitemia of malaria