Eli5 if disease’s want to live in a host’s body without being discovered, then why do they have such nasty symptoms that can be used to easily identify and destroy them?

Question

Eli5 if disease’s want to live in a host’s body without being discovered, then why do they have such nasty symptoms that can be used to easily identify and destroy them?

In: 106

Answer 1

Most of the DNA in the human body doesn’t even belong to the human. There are thousands of kit millions of species of fauna and flora that live on different parts of the skin and hair and digestive tract. And sometimes when the flora or fauna get where they’re not supposed to be they can cause illness.