We're only testing people whose symptoms exceed some level of severity.
Agreed. And I doubt that's being applied consistently facility to facility, Dr. to Dr., etc.
Assuming a consistent percentage of total infected become severe enough to warrant testing, we can say that the infected population is increasing at the same rate as those with severe symptoms. For example, if 10% of cases require hospitalization then that will always be 10% of the total infected whether it's 100 people or 1 million people. If the number of hospitalizations increases exponentially, that's a good indication that the general spread is also exponential.
It really boils down to which age groups have had the most exposure to this point and how the measures taken thus far will affect those age groups. (Hopefully the recommendations put in place benefit the most at risk)
FYI, here's the data with both exponential and linear trendlines. Exponential fits MUCH better (Rsq or 98% vs. 80%). If it were linear, we should have had MORE cases last week. The exponent indicates this is growing at about 18% per day in Iowa. I haven't found any other state-level data for comparison.
I'm actually surprised the two are still that close. It'd be interesting to see similar data from other states. The current trend is concerning obviously.
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