Question: sir/madam, before some days I had gone to a pathological laboratory for semen analysis test. The administrator provided an empty room(where a laboratory technician was testing something and she was asked by the administrator to vacate the room so that I can masturbate and the semen can be collected). During my masturbation my pant and the bottle (which was given by the laboratory for semen collection) fell on the floor of that room just before ejaculation and I suddenly took those and put the semen in the bottle(during this process the bottle touched my penis). I afraid that if some blood(of any other person) or semen(from other person) fell on that floor before me and it touched the bottle or my pant. Is there any chance of HIV infection by this way if that blood or semen is infected by HIV ??? please help me. As far as I remember there was no visible blood on the floor but I am not sure...