> It would be amazing if an Omicron infection produced antibodies that fought off COVID & Delta, as that could rapidly bring relief to the pandemic, but I haven’t seen that suggested anywhere yet.

There has been a study that suggests Omicron infection provides protection against previous variants. This correlates with data from the UK that suggests Omicron is displacing Delta.

https://www.youtube.com/watch?v=PYLbJ0H8zdc (link to study in description).