The animal that kills the most humans is the mosquito, causing 720,000–1 million deaths yearly through disease. The second deadliest species to humans is humans themselves, at roughly 430,000–475,000 killed by other humans annually.
When syphilis spread across Europe, Naples called it "the French disease" and France called it "the Neapolitan disease." European countries then named syphilis after whichever nation they considered most immoral—the Spanish disease, the German disease, the Polish disease, and so on.