There is also a small subset of the population who doesn't build an immunity to the disease. A friend's mom caught Covid last December before a vaccine existed. Her body isn't creating antibodies so -- as of the last time I texted that friend -- she's had it for at least 8 months. She was an incredibly friendly and social woman who has basically been turned into a Typhoid Mary that does experience Covid symptoms (and has intensely self-quarantined).

I don't know how many other people this has happened to but I too have my doubts as to whether there was ever any hope of containing this.