Seen as all the symptoms people get from viruses are actually caused by their own bodies immune systems (fever, cough, blocked nose, lung inflammation - all literally caused by your own body attacking the virus, not the virus itself) what would happen if our bodies just....didn't attack the virus?

Just left it alone. Would we get other types of symptoms and eventually die, or would nothing happen? I'm rather annoyed that our own bodies cause us so much distress and pain - seems kinda gay. Pic semi related, but I'm not just talking about covid. Influenza too.