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From CDC —

The complete clinical picture with regard to COVID-19 is not fully known. Reported illnesses have ranged from very mild (including some with no reported symptoms) to severe, including illness resulting in death. While information so far suggests that most COVID-19 illness is mild, a report out of China suggests serious illness occurs in 16% of cases. Older people and people of all ages with severe chronic medical conditions — like heart disease, lung disease and diabetes, for example — seem to be at higher risk of developing serious COVID-19 illness.

Situation Summary, Centers for Disease Control and Prevention, March 15, 2020

So how much higher are COVID-19 rates of infection and morbidity compared to the full suite of respiratory illnesses involving the same set of variables, especially x patient / target’s age, preexisting conditions, and vulnerability (physical condition)?