What do we know about the coronavirus pandemic, and what don’t we know about how it spread across the United States?  And why do we lack so much important information?  Justin Lessler of Johns Hopkins University is on the cutting edge of epidemiology and has been followed Covid-19 since the first reports our of China.  And what do we now know about them? 

Computer models say the last 3 months of 2020 may be the worst yet for the Covid-19 outbreak in America.  Lessler puts the prediction in perspective.