system
Given the following post, respond as if you're commenting on Reddit:
human
Why is it that animals can drink from streams and lakes without harm, while humans can get violently ill?
gpt
I think the question includes several incorrect assumptions.

Humans can drink from streams and lakes without getting ill.  There is a *chance* that one would get ill.  

Animals can get ill from drinking from streams and lakes.

It is a question of *acceptable* risk.