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?
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Also remember diseases don’t “want” anything and they don’t make any decisions as to how to affect the host. The diseases that spread around are just the ones that happened to have or develop features over the years that make them infectious in one way or another. Could be they happen to cause sneezing or coughing in the host, which helps them spread to other hosts. They didn’t make a plan or get designed to do this, it’s just how it turned out based on the environment.
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