kraftiekortie wrote:
There are certainly quite a few extra hospital admissions and deaths in NYC.
This is no run-of-the-mill “flu.”
As we have seen in Italy, in some towns, the number of deaths is more than 4 times, as compared to last year's number. What does this mean? It means a lot of people died at home, either from COVID-19 or from other illnesses. The health system was overwhelmed, so I don't think they did any postmortem sampling to check who had the virus.
https://nypost.com/2020/04/02/italys-coronavirus-death-toll-likely-much-higher-than-reported/By now, we are pretty sure this virus is at very least twice as deadly as seaonal flu, and most likely 4 times as deadly.
So, I did a quick calculation. If we take the mortality rate as 0.4% (four times the mortality rate of seasonal flu), then we can infer how many people are truly infected with COVID-19 in Italy. Bear with me a bit. There are currently 16,523 deaths in Italy, according to WorldOMeters. However, this figure lags behind the confirmed cases. So, we have to extrapolate a bit, like by 7 days or so. Italy's death doubling period is currently around 15 days. So in another 7 days the multiplicative factor is around 1.4 (the square root of 2). The number additional deaths not reported in hospitals is a factor 3~4 in heavily hit towns. Let's be conservative and use a factor 2.5 for the entire country. So, we can infer the total number of people in Italy infected with COVID-19 as
16,523*2.5*1.4/0.004 = 14.5 million people
Italy has a population of 60 million people. This means 24% of the population has already been infected. So, there is no surprise to see that "herd immunity" has started to kick in. For COVID-19, given that R0~3, to achieve herd immunity, you need 1-1/R0=67% of people having immunity. I think the 24% figure is consistent with what we see in the situation in Italy: number of cases starting to dwindling down fast, due to partial herd immunity.
In other words, I believe there is some basis to suspect that the true mortality rate of COVID-19 is 0.4%, or four times deadlier that the seasonal flu.