That's an interesting approach, Aktak, but I fear that your answer would you you dinged by people who are looking to see if you are thoughtful and inquisitive. It's one thing to have never taken a Micro or Bacteriology class, but one presumes that you've been exposed to learning about these things as an undergrad, and have the breadth of knowledge to take a decent stab at the question.
With insects, this is getting into looking at how you view the world. You can't have gone through life without encountering an insect. Sure, some of them were bad, like fire ants, or yellow jackets, but no wonder or appreciation for a butterfly, ladybug or praying mantis. I fear you'd get dinged even more here.
I have favorite people in my life, favorite memories of my elders, and favorite activities that excite me. Would I be screwed if I answered that way because that’s the reality.
Probably, if you weren't asked about this. You're expected to be able to understand a question.
No fave virus? That I'd cut you slack for!
Another point to make here...sometimes you have to be able to BS an answer, simply to show that you can think on your feet.