Would you ever intentionally make someone sick?

In the 3rd grade, a kid came up to me, coughed in my face, and announced, “I just gave you the mumps!” And he was correct.

Years ago, I had a peer at work who we all were sure came into work sick just to get his fellow managers sick. When he was sick, you could be sure that he would have something that day that he had to talk about with you in your office, with the door closed. It was a joke among the fellow managers.

Would you ever engage in this kind of “biowar”?