To answer your question, no, I wouldn't render aid, just like I said before. But my reason for not rendering aid are not the reasons you gave.
If I did decide to render aid, the decision would be made by me and the consequenses, if any would be suffered by me. In effect, I am willing to bet my life on my decision. Why ? Because I do so, on a regular basis. About the time you started working in a trauma center, I began working as a professional paramedic. I work in a high call volume system (Las Vegas) and have spent quite a bit of time on some of the busiest paramedic rigs in the world. This situation described is right up my alley. When something like this happens, I am the one that shows up. I have been on this very call numerous times. On a daily basis I deal with persons who feign illness or injury. Sometimes a dozen or more a day for the last 23 years. In my own mind, I am good enough at it that I am willing to bet my life on my decision: just like I do on a dialy basis. I am sure that you will agree that any medical professional worth their salt can recognize a "sick" patient.
As far as the bodily fluids, second verse, same as the first. I have been spit on, bled on, vomited on, urinated on, deficated on, more times than I could count. Hell, I spent four years on the Haz Mat team. The day that I made my post, I had three calls where some part of my body or my uniform came in contact with urine. Again, this has been happening for 23 years. This is like asking a mechanic if he ever got greasy. These are not people lying in the hospital, these are winos, criminals, crack whores, or what have you, in their natural habitat. I am not worried about coming in contact with one more.
Is there danger ? Sure. Would I purposely try to become contaminated ? No. But it also wouldn't influence my decision whether to do something for this guy or not. Furthermore, in the years that I have worked at this job, I have never known any one of my fellow workers to contract HIV. Out of the hundreds that I know, a couple have contracted Hep C.
That stuff would be the least of my worries.