Your gut flora would probably be completely different and more resistant to those things if you ate all your meat raw.

AFAIK, the immune system has some ability to adapt to different pathogens, but this doesn't mean that eating significant quantities of raw meat wouldn't pose a health risk, particularly for a long-lived species such as humans.

Are other animals affected by food poisoning to any significant degree?

AFAIK, trichinellosis is endemic in wild carnivorous mammals.