Errr....this really looks really bad.
@dad4 I need your help interpreting the number here, but it looks like we are in a race between vaccination and a real super bad spring wave. If I'm interpreting the numbers correctly, to suppress the new variant would require a superstrict lockdown (far stricter than the stupid Newsom December lockdowns) for which there is now virtually no political will left to do. The best thing that could happen is the J&J and AZ vaccines could get rolling quickly and we use those to vaccinated the 40s-60s and essential workers, but the FDA is doing it's FDA thing and is making them jump through hoops to submit.
@dad4 would be interested in what you think.....
You need to get some good data on virus transmissibility, vaccine effectiveness, and cross immunity by variant. I don’t have all that, but I can give you an idea of my logic:
The regular variant kicked our ass. R0 was only 3, but we still had to infect 60% or so of the population in order to get over it.
That puts our NPI as 1/6 effective. It takes R=3 and drops it to R=2.5. Multiply by 5/6.
b.117 has a higher R. maybe R0=5. Add in our lame attempts at NPI, and you get R = 25/6.
So b.117 wants to run until it gets 1-(6/25) of us. 76%
Fortunately, the vaccine mostly works, and that may mean that normal immunity mostly works. if both work 90% of the time,
you get 54% have working natural immunity and another 9% have vaccine immunity. So, 63% have a working immunity. The virus infects another 13%. So, about 1/4 the size of our winter surge. Not fun.
Also preventable. Many local areas manage NPI that is better than 5/6. LA might be around 1/2. They took a variant with R0=5 and made it look like R=2.5
If the nation can do as well as LA did, b.117 would not spread. We’d be starting at 63%, but we’d only need 60. Unless you significantly change behavior, I don’t think b117 will hit LA very hard at all. The rest of us are in trouble.
When you run the same computation on the SA variant, it looks much worse. Might be delayed because it will first hit during summer. Might not. (need a good way to represent weather.). Either way you start with much lower immunity, because the vaccine and traditional immunity are both less effective. You’re still driving towards 75% or 76%, but you have further to go because you start much lower. So, 30% of us get it if it can beat the weather, 25% if it has to wait for fall. twice as bad as b.117.
Or, so says a math guy with no epidemiology training.