Hello, I have read similar questions on this site, but nothing exactly like my situation. My daughter is severely autistic and can be very erratic in public bathrooms. As such, she bolted into a stall before I had a chance to check to make sure there wasn't anything on the toilet seat. She pulled down her pants and peed for about a minute then stood up. When she did, I noticed a smear of pink/red blood (not hers) about the diameter of a lime on the right side of the toilet seat as well as what looked like wet blood in the gap of the toilet seat (the part in between the two sides where the bowl underneath is exposed.) The blood on the part of the seat where where she sat didn't look completely dry as it was still red,/pink although it was not fresh droplets either, so prob somewhere in the middle of fresh and dry---looked like it had been sat on more than once potentially. It was definitely the menstrual blood of a previous person. I immediately checked my daughter's legs and buttocks and did not see any blood on them or what appeared to be open wounds, either. But because my daughter often scratches herself, I have become paranoid that maybe she had an opening I did not see that could have allowed for entry of a virus into her bloodstream, perhaps even if her thighs also touched the blood sitting in the gap of the seat. I am mostly concerned with hepatitis C as my daughter is vaccinated for Hep B and I know HIV doesn't survive as long in the environment as Hepatitis. Thanks in advance for your kind input. 

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Thank you so much. Much appreciated. This thread can be closed.