If it wasn’t exponential, wouldn’t the line be flat on a log graph (slope = 0). It just means our various measures, including those eeeeeeeeevil HCQ treatments, are decreasing the actual exponent, which is better ‘n’ nuttin’.
(BTW, I love how the recoveries are currently outpacing deaths.)
Yes, exponential growth shows as a straight line on a semi-log plot. The slope is greater than zero; zero slope is a horizontal line. The Gompertz function is an example where the exponent steadily decreases. It is an S-curve if shown on a linear plot.