I recently shared a car key, with someone I do not know, to do a bump of cocaine. While the cocaine use was bad enough, I am now extremely worried about having put myself at risk for Hepatitis B, Hepatitis C. I'm not so much worried about HIV. I do not believe that there was any fresh blood on the key. I am worried sick over this and have not been able to sleep. What is the likelihood of contracting Hep B, Hep C, or HIV, from such an exposure of sharing a key? What is the risk level associated with having shared a key one time vs. sharing a straw, for example? I did not share any straws or banknotes. This was recently just a one time thing that I engaged in, and again, it was just done with a key and was one bump. I did not see any cuts in my nose from having used the key. I also keep reading information that intranasal (sharing straws) activity is a low risk activity on some sites so I am really confused. What defines "low risk"? Should I not worry and not be concerned for testing? Thank you for all of your help.