I was at work the night before last and was training a colleague, as I do work as a security officer, so I was showing him how to unlock a staff entrance door, sounds a bit silly but these doors there is a knack to opening them by holding the latch and turning a key, anyway upon showing him how to use the door he was touching my hands at the same time, I then noticed immediately that I had a cut on the cuticle on my left thumb there was a little bit of blood present I think it was mine as it was sore, but could he have got his blood into it also, I did ask him if he had any cuts and he responded with no, am I being paranoid , could I get hiv or hepatitis this way. Please help I m sick with worry , not eating or sleeping properly..