What is the true mortality rate? All the numbers are based on positive test counts, but testing isn't being done for most people with nominal (casual) symptoms.

What is the true mortality rate? All the numbers are based on positive test counts, but testing isn't being done for most people with nominal (casual) symptoms. This has led to a situation where we think (for example) 2% of positive cases die, when in reality, there may be millions of positive untested cases resolving without issue.