Where people get lost in thinking about problems like Coronavirus is that, for most people, it's not natural to think in terms of exponential functions; instead, we think linearly. Thus, if there are 100 deaths so far in the US, and this has been going on now for a month and a half, then by the end of April we'll be at 200, a tiny number compared to the flu, right?
Wrong. Epidemics actually follow Farr's Law, which is a bell curve, but in the early days, until, say 20-30% of the population has been infected, that is very similar to an exponential function. How does that work? The US had 35 cases on 2/23. The US had 321 cases on 3/5, so it took about 12 days to go up 10 times. On 3/15 it had 3777 cases, so it went up another 10 times in 9 days. Let's use ten days for the time to go up 10x.
If they US were simply to ignore it, and just let it take it's natural course, since the US currently has 5,723 cases, on March 27th it would have about 57,000 cases. By April 6 there would be 570,000 cases. By April 16th 5.7 million cases, and by April 26th, 57 million cases (actually less, because by then it would start to deviate to a bell curve, and no longer follow the exponential curve).
What would that mean for deaths? In a best case scenario, of optimal health care, it seems that deaths can be held down to about 1%. However, if the healthcare system becomes overloaded, and has to start just ignoring patients and letting them die, as happened in Wuhan and Italy, and as it starting to happen in Spain, not surprisingly, the death rate shoots much higher. In Italy it is currently 8%. In Wuhan it was running 6%. In Iran it is 6%. Spain is at 4.4% and climbing.
Once the US gets over about 50,000 cases, the hospital systems in some areas will be over capacity. By 1-200,000 cases, that will be true virtually everywhere. Thus, if the US chooses to simply ignore it, and decides that sporting events, and the right to dine out and visit bars is more important than the public health, the foreseeable end is some 60 million cases, and 5 million dead, and there really isn't any debate about that. Is 60 million cases a ridiculous number? There are typically 60m flu cases a year, so why would 60m Covid19 cases be unexpected?
So, which is a greater cost to society, and the economy? Closing bars and restaurants and businesses and temporarily crushing the economy, or letting millions die, and millions and millions get sick, some very sick, with perhaps permanent lung damage to retain as a memory?
As for the "it's just like the flu", well, um, no. 60 million people do get the flu every year, of which 20,000 die. It is perfectly possible for 60 million to get this, too, but the death toll would many magnitudes higher. It is very, very unlike the flu. But, but, but most will recover... Sure, 90% would recover, but of those, 10% would take 1-2 months to do so, and the rest 2 weeks minimum. The regular flu is much quicker.
Am I saying that 5 million are going to die? Absolutely not. We aren't going to let that happen. We are going to cancel large gatherings. We are going to wash our hands frequently. We are going to practice social distancing. And we are going to reduce the rate of spread dramatically, which will flatten the curve so that the hospitals don't get overloaded. That in turn will lower the death rate to probably between 1 and 2%. And, why are we going to do these things? Because the consequences of the alternative are too awful to even consider any other course of action. We don't need to repeat the disaster in Italy. We can learn from their mistakes, and do much, much better.
Oh, and what of the argument that "we don't need to do anything... it will vanish with summer"? Maybe it will, maybe it won't. I'm not optimistic. Supposing that I told you that the growth rate in new cases over the last week, in the following areas has been:
South America: 38.3% a day increase
Caribbean Islands: 34.0% a day increase
Central America: 32.8% a day increase
North America: 30.3% a day increase
Africa (except N. Africa): 30.2% a day increase
Europe: 22.6% a day increase
North Africa: 20.6% a day increase
Middle East 11.3% a day increase
OK, maybe it doesn't spread as fast in hot dry climates, but is still summer in the southern hemisphere, and it is spreading even faster there than it is here.
And, for those that don't grasp the seriousness of this, here's an article from the WSJ about the situation in Italy:
https://www.wsj.com/articles/every-day-you-lose-the-conta... And, here's are more pieces of data to process:
1. China still reports 2622 patients in serious or critical condition. In the last month they have only reported about 4000 new cases. Thus, the vast majority of those in serious and critical condition have been hospitalized for over a month.
2. In cases outside of China, there have been 5035 deaths. There have also been 13,288 patients who have been declared as recovered. Thus, 27.5% of the cases that have been resolved outside of China have been resolved with a fatality. Does that mean 27.5% of people will die? No. It means that those that die, die fairly quickly, usually in about 2 weeks, while those that will recover have a very long struggle before they do, on average about 35-40 days.
Last Edited: 3/18/2020 11:51:16 AM by L.C.