Pandemic mathematics

Mathematicians who designed tables for viruses and pandemics say it like this:

IF you see 1 to 2 cases of coronavirus tested in your area the likelihood is that you have 100,000 to 200,000 cases of carriers and infected people in your area. Just thought you might want to know.

 However, when I tested this table on our present number it cannot work because you wind up with 18, 139,500,000  people with coronavirus so this cannot really work at the level we are presently at.

So, this table might work at 1 or 2 cases in your area but doesn't work as number increase to the present which is 181,395 cases of coronavirus in the U.S. tested positive as of today.