An important scene in my book has a character dying slowly from mistreatment and injuries. I need her to be unmistakably dying, yet able to deliver a final speech, and ask to be put out of her misery. Can someone give me the basics on infections in open wounds, both what they do and what they look like?
The problem is ...
Dying of infection would be more like your gal hurting and drifting in and out of consciousness, hour after hour after hour, gradually getting more and more feverish and vague and confused till she can't be brought back to consciousness again.
You don't get that sort of sharp clean break between thinking and talking and then,
gack urk twitch, dying.
Infection isn't so good for 'final speech' -ness.
Now you
could have a patient under sedation for pain from the injury, and the doctor witholds pain medication long enough for the patient to become lucid if they had to say something. Then, when the necessary words were said, the doctor could put them under again.
That might give you the setup you need.
The 'unmistakably dying' part gets iffy. Mostly, if the patient is still up and talking there's a good chance they're going to make it. There's always a new antibiotic to try. 'Unmistakable' tends to comes into play when the patient is in much worse shape.
If you want infection, rather than death by organ failure, consider belly wounds or a Central Nervous System infection.
Have you considered burns?