“The spitting image, right?” “I’m surprised there’s a parasite this pretty.” “Well, it causes food poisoning, so it’s a harmful one to humans.” Kousaka put down his phone. “Are there any more interesting parasites like this?” “Hmm, well, let’s change course a little for the next one.” Sanagi folded her arms and thought for a while. “Since you’re such a clean freak, even without studying parasites, I’m sure you know Toxoplasma gondii?” “Yeah, naturally.” Finally, a name he recognized. “They’re parasites that transmit from cats to humans, right?” Sanagi nodded. “Yeah. They’re famous as the cause of toxoplasmosis. Their final hosts are cats, but they can infect most warm-blooded animals, which of course includes people.” “Final host?”, Kousaka asked, an unfamiliar term coming up quickly. “The host that’s the parasite’s final destination,” Sanagi explained in layman’s terms. Some kinds of parasite will infect different hosts in various stages of growth. For instance, Anisakis, nematodes that are the cause of anisakiasis, first incubate in water, then are preyed upon by crustaceans such as krill. They avoid