Normies live in "proven" science, rather than "reason". They can't reason themselves, they can only defer their minds to the great authority, "Science". I find that charts showing the decreases in cases after introduction of ivermectin are most effective. I wouldn't bother mentioning parasites, because (a) it's not "The Science", meaning it's just too far out for them, and (b) metaphysically, as selfless altruists, in a way they see themselves as parasites, and empathize with parasites, and think killing parasites is evil.