In San Diego at peak outbreak season more than half of the outbreaks were traced to bar/restaurants. The point is what you put on the denominator to have a reas

In San Diego at peak outbreak season more than half of the outbreaks were traced to bar/restaurants. The point is what you put on the denominator to have a reasonable ratio. It should be the traceable cases not total cases. Most community spread cases can not be traced. And even traceable cases may not all be meaningful: a prison may contribute a large amount of cases but not much to community spread. Counting outbreaks is likely a better measure.