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No, that game seems to be about cancer, and I specifically remember a "mission" brief saying the guy you'd be in had rabies, or was bitten by a rabid dog, or something to that effect. Also, it looks like it's third-person instead of first-person, and it came out about 7 or 8 years after I would've seen the game I'm looking for.
Edited by shigmiya64I've never played this one, but could it be Life & Death?
http://www.mobygames.com/game/life-death
Could you say what does not fit 3d Body Adventure? There was a shooter game in it called emergency and it fits every point of your description. Here's a video: https://www.youtube.com/watch?v=BfHnv-5InCM
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I think this was an edutainment title of some sort for computers. It was a first-person, Doom-like game where you explored the inside of people's bodies. I'm pretty sure you played some type of surgeon, and you had to fight various diseases by somehow attacking them. You could also explore the hospital where you worked, I think, also in first-person.