This is a very common question people asked, how long it takes the virus to die in the dried blood, such as a little amount nose bleed. I searched on internet, but the answer was not unique. Someone says few mins when other says few hours. The reason why I asked was that my colleague had nose bleed all the time. He often use my keyboard. Once he use his finger to wipe the blood off when he is typing on my keyboard (without wash his hand). I used the keyboard about 10 mins after that. The problem is I feel my skin was itch and I scratched my skin. I think my skin was a little broken since got some blood on my finger. It didn't cross to my head until one day I red an artical about hiv. I am worried since then. So, is there anyone know how risky I am? Should I go aheah to take a hiv test? Or am I just playing with my mind? Thanks for anyone can help.