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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First, the goal of every disease to spread, to “procreate”. They are mindless and while the disceory chance increases, if it increases the transmission and successful spread more, than the loss due to discovery and immune response, it is a positive change.
Just laying dormant in the body having a low reproductive rate and hiding, is worse than making the host ache and sneeze and vomit. Eventually the hidden organisms either die off or got destroyed anyway.
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Second, many most obvious symptoms are caused by your immune system and reflexes, rather than the “pathogen”. Fever, coughing, sneezing, increased mucus production
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Third, survival of the fittest… the version that could spread and multiply wins… again, lying dormant doesn’t work, just in extreme cases
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