Will agree with mkh9 about the different color towels system.
More icky than dangerous in my opinion.
I wouldn't worry about it.
Do you know if your roommate has hepatitis or HIV? I doubt very much that you would get it and I think you would know if you got it in your mouth, nose or eyes. I wouldn't worry too much unless the person has one of these diseases. Then perhaps you could get checked. I really doubt it though. Maybe you should use different colors.
I don't care how late I was to work, I would have showered, now about the feces , think about it, it's waste right , yes well it carries toxins that's why it leaves the body and also carries ecoli , I'm sure you are fine and hope you have showered by now. Thanks and good luck