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Two reasons, one is our lymphatic system (our immune system), and the other is the billions of other beneficial bacteria that live in and on all humans, which keep the bad bacteria at bay.

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Q: Why do humans not constantly get sick with bacterial infections?
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Can you get sick from an hawk's feather?

Yes, I believe you can catch viral and bacterial infections from a hawk's feather.


Why do humans not get sick all the time?

Because they have antibodies in their systems which help fight off infections.


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No. Mold is a fungus, not a bacteria. You can get mycotoxin exposure to certain types of mold, which will make you very sick, and can even be fatal in high enough concentrations. However, you can only get bacterial meningitis from certain bacterial infections.


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Can your dog get sick from you?

Yes, but it is far more likely that you would get sick from your dog. Humans usually are far more hygenic than dogs are. (We don't eat off of the ground, drink from puddles, eat sewage, roll in dead and decaying carcasses, etc.) And we don't go around licking the insides of just anyone's mouth that we get the chance to, while dogs may. There are a handful of viral infection that humans and dogs can share (such as rabies), but there is a whole wonderland of bacterial and fungal infections that will infection anything they can get into.


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Why sheep don't get sick?

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