How Many People Get Sick with Flu Every Year?
A 2018 CDC study published in Clinical Infectious Diseasesexternal icon looked at the percentage of the U.S. population who were sickened by flu using two different methods and compared the findings. Both methods had similar findings, which suggested that on average, about 8% of the U.S. population gets sick from flu each season, with a range of between 3% and 11%, depending on the season.
https://www.cdc.gov/flu/about/keyfacts.htm
Given that 8% people get the common flu each year in the US, and the common flu R0 is around 1.3, if the R0 is possibly 5 for the new virus, likely 32% of the population will be infected in a season.
Going to the serology tests, those numbers are slightly lower than 32% , but the season isn't finished, plus, those tests didn't include known patients who are known to have had the virus.
This means we were likely so very far off our early thoughts on how infectious this is, and the fact it was new, we learned to place people on their stomaches, for instance, it saved many lives, or, ventilators may cause more harm in certain patients than help, also saving lives.
Also, because of its infectious rates, we held many people at home, with no or very little medical helps, until they either rode it out, or got sick enough to have to go to hospital.
This too ,people died.
So, as we get on top of this, likely our entire mindset will change. Just like anything else.