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Hello, My name is Dr. Greg. I am a U.S. trained, board certified physician, and am happy to assist you with your health concern today. Please allow me a few minutes to read and respond to your question.
No, HIV cannot be transmitted via dried blood. The virus dies immediately when the blood dries. So, even if the dried blood is dissolved in water, the virus cannot come back to life.
No, based upon what you describe, you wouldn't be at risk for HIV. There would be a very low likelihood of enough blood on the toilet paper to be able to transmit HIV. So, no reason to be concerned.
The toilet water would dilute the blood to the extent that a person would not be able to contract HIV from it.
You're welcome. Take care.