Quote:
Originally Posted by ToothSayer
This is completely wrong. The baseline is almost irrelevant and it's only the R that matters. Why? Because exponentiation is far more powerful. Let's say the US has 5x the active cases of Europe right now. Let's say some moderate level of distancing remains (which it will).
After 15 weeks of late fall and winter:
100,000 * 1.8^ 15 = 674 M (the entire population of Europe)
500,000 * 1.2^15 = 7.7M (not many people at all)
The difference caused by partial immunity is incredible. A lot of key areas in the US are at 20% infected, some of the very high spread communities like minorities over 30%, and the effect on R is even higher - like 30-50% - due to the fact that it's the most social/active/irresponsible nodes now immune. Thus if R is 3 without distancing it's going to be at 0.5-1 lower in the US. That's huge. the difference between a hospitals-overwhelmed hard lockdown pandemic and a manageable slow burn.
This has all been modeled by the UK influenza expert group in the UK back in March; here is what I've described above in graph form according to expert influenza modellers:
You can see how the "burn through in a manageable way in summer" second wave is far less severe, and total deaths far lower, than the "get it very low through summer" strategy that Europe followed.
What's more, the US situation can easily be contained by marginally increasing restrictions (see for example Texas and Florida among others which went into rapid decline when this was done) in a manageable way that doesn't mess up lives and economies. That option isn't open to the lower immunity, higher R communities come winter.
People don't intuitively understand exponential growth which is why most people (including experts) comically screwed up the analysis and impact of this when it was first spreading. You're making the same mistake above.
I always get irked by people speaking in absolutes but I will try to put that aside.
But lets first simply address that first point.
I understand how the exponential will close the distance, GIVEN ENOUGH TIME, but you are putting in some massively flawed assumptions.
First off you assume these countries would see the exponential explosion happening in real time and do nothing to counter it.
Second you assume the US will not see directional changes and will continue to fall.
The US, due to very poor management is still, in most regions dealing with its first wave. We have seen almost everywhere, that when you beat that first wave down and seem to have it under control, it comes back and R starts to rise as things re-open more and more.
So Georgia, Florida, Texas, etc can still look forward to the types of resurgences Europe is seeing and this time in the Fall/Winter months.
What I am saying is that you are making almost every 'good outcome' assumption based on the US and almost every 'bad outcome' assumption based on Europe in an attempt to frame it as "US doing great, everyone else is doing badly' and that is nonsense.
None of those countries would want to change spots with the US heading into the Fall/Winter and have this mass of ALREADY infected populace walking around and all the NEW DAILY CASES being added as opposed to a massively lower baseline that when the R again starts to rise they have so few cases that they have time to check it again.
You need only look at Canada as an example. They squashed the virus before the reopening. Things really started to rise in each province with R spiking but with so few cases they have been able to gradually (without reclosing) been able to bend those curves back down.
It is the LOW BASELINE that allowed that time and made it such that they did not have to resort to extreme measures again.
The US with its exceptionally high baseline has almost no room for error. You see an uptick or change in R at those already sky high levels, and it could instantly put the healthcare system at risk of tipping over.
So your conclusions seem far more 'optimistic' in all assumptions re the USA and assuming worst case in all other, in an attempt to frame the US as handling this great and others not. I will leave it to others to figure out the 'why'.