Are you unaware that Fin is a trained biologist? So, I guess where she gets these ideas is through training and education. And you.....
I don't think you understood her point about you and malaria. Marlaria was cured in hours or a few days depending on which version of Humble's tale one reads, which means it knocked out a tough little bug very quickly. So, why would it take so long to knock out your bugs or whatever you're trying to get rid of. Why not three days.