Pandemic Expert Dr. Michael Osterholm Claims That 5% of U. S. Population Has Been Wuhan Infected Based On What?

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This morning on MSNBC, wuhan analyst Dr. Michael Osterholm said that about 15 million Americans have been infected by the wuhan, yet governor Cuomo said that many have been infected in the state of New York alone, so on what basis does Osterholm make that assertion (“5% in the U. S. have been infected”), to what study is he referring, and why doesn’t he state the supposed basis of his assertion?