All viruses are like this. The first time a new mechanism originates, it decimates the population because nobody's immune systems have any protection of any kin

All viruses are like this. The first time a new mechanism originates, it decimates the population because nobody's immune systems have any protection of any kind whatsoever. That's how you get a New York scenario -- everyone exposed gets infected, very few people have natural immunity. Hospitals explode. Fast forward 2 years. Many many people have had Covid and many many people have been immunized. Even if you get exposed a year later, the immune system has at least some idea of how to handle it. You get sick, but your immune system can fight it off. For a little while your immune system will completely annihilate any virus that it encounters, but after a while it chills out.