[Rather amazingly, she's not insulted, since his tone and body language don't convey that. Well, that and he didn't explicitly call her gross.]

Well, I don't think "my" germs would matter, since I'm a different species, you know? It's like I don't get human diseases, or... Well, I don't get sick at all. [She waves her hand a little] You wouldn't get that sick though, would you?