Mystery Solved?

One of the most persistent mysteries of the COVID-19 pandemic in the U.S. is why cases have largely plateaued (until the last couple weeks) while mortality figures have fallen substantially. As we’ve discussed, there’s been an ongoing debate about disentangling the evolving case counts from the ongoing rise in the number of tests being conducted every day. But particularly as cases started to rise in June it is clear that cases are growing well in excess of what can be explained by more testing. So why have the daily mortality numbers dropped? Why the disjuncture between the two numbers, even taking into account a two- or three-week lag between spikes in new cases and people succumbing to the disease?