Hey Jake. You're a phys ed teacher. I think you already know the answer. You'll pick up no more diseases from that guy than you will from the office water cooler or a bowl of pretzels at a party.
There's a more important issue here. Why the hysterical reaction? Yes, hysterical--there's no other word for it.
What are you feeling guilty about? What memories does it raise? Does it make you feel bad? Why? What's so threatening about being out of control?
I'm a bit worried about you, Jake. I recall some of your previous posts.
Just remember you're loved, and take care of yourself.