Earlier quoted context omitted.
> But everything we know about existing respiratory viruses (and indications so far this year) suggest antibodies will wane. Not necessarily the case. Infections with HCoV-229E produces durable immunity and reinfection is due to antigenic drift: https://www.biorxiv.org/content/10.1101/2020.12.17.423313v1 That it at odds with prior studies that found ~12 month reinfections with coronaviruses, but it is with considerab…
Setting up two likely scenarios is a very reasonable way of approaching future development, both scenarios sound likely to me. We could look at the flu for clues, in that case every year will have one or more variants that are the most prominent. I'd argue that in the age category with the most infected (10-29 years old) in the UK, that these people are not killing themselves due to their young age. And the elderly h…
Like the 1918 H1N1 second wave mutation that caused ARDS in 20 year olds?
We still have no idea how that happened, but with this coronavirus evolving to be more transmissible/virulent that is still on the table. If it can evolve to become more transmissible but at the cost of triggering ARDS like that, then it will face evolutionary pressure to do so.
And hospitalization rates of 20-29 year olds aren't anywhere near as good as the fatality rates. While the death rate drops by a factor of 2 every 8 years, the hospitalization rate drops by a factor of 2 every ~15 years. And delta has 2x the hospitalization rate of alpha across age/sex/deprevation/comorbidity matched controls. It should still be about a 1-in-50 chance of hospitalization for 20-29 year olds. There's no proof that number can't continue to get worse.