Today I had a situation where I walked into my workplace bathroom and as I was wiping the seat before sitting down, I noticed something that appeared to be blood at the inner tip of the seat. Basically, it seemed like a previous visitor who apparently was on her period had accidentally left some on the seat. "No big deal, it's just the toilet seat" I thought and I wiped it away before sitting down and doing my business. I don't recall much else in detail because it seemed like a regular trip to the bathroom. Obviously, half an hour later, the panic started. Would I have been at risk at contracting HIV or Hepatitis C from coming in contact with the blood by sitting on it, my genitals coming in contact with it or touching it in any other way?
I keep stressing out about touching it with my hand when wiping it. I also worry whether I washed my hands after wiping it - I must've, but I don't remember. I have a habit of picking my nose as well and it was slightly bleeding today - I'm scared of somehow having done that after touching the blood.
Could the blood on the seat carry any risk of infecting me with HIV or Hep C?