Um, well your exposure sounds like it wasn't extremely high risk. Was there blood clearly in contact with your open sore? Either way, for peace of mind I strongly recommend getting tested as soon as possible, and then at 3 month and 6 month mark. Most people develop antibodies after 45 days. This is an average though, some sooner, some later.... So maybe try the 45 day mark too. As for how long hiv survives, i'm not too sure. I know that as long as there are white bloodcells though, the virus can still be alive. Was this a little kid's blood/urine or was it a prostitutes? That might calm your worry, if you were to find out. Hope this helps.

Your risk of hiv infection is extremely low. Urine does not carry sufficient quanitities of the virus to be infectious. If there was blood in the urine, then there is a remote possibility, assuming that:

1. The urine came from someone with hiv
2. The urine had only just been 'deposited'. Hiv cannot live outside the body for more than a few minutes

and even if the above two are confirmed, chances of infection are very very low. People assume, quite understandably, that because of the lethality of hiv, it must be very east to catch. It isn't. Not very easy at all. Don't worry. But for peace of mind, test at three months.

Do not assume someone's hiv status from who they are. True, it is more likely that a prostitute will have hiv than a young child, but you don't know individual circumstances. Children can have it too, unfortunately.