Some things are just poisonous no matter how many times you encounter them. A disease might be something your body’s immune system can learn to recognize and combat more efficiently, but if you drink bleach your body isn’t going to get better at handling bleach. There is nothing to learn there, it is just bad.
The problem with bacteria that spoil food is not usually the bacteria themselves but their poisonous poop. This is also why you can’t just cook spoiled food and make it better by killing all the bacteria. The poison is still poison.
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