The Infection Chain

As I've said before, the progress of the pandemic seemsto have been from the most mobile and therefore whitest and wealthiest people, seeding various countries, then within the country a progression down the chain from most connected to least connected with the most vulnerable. Think of it as a forest fire, with the progression being governed by which unburned spots are most closely connected to burning spots, and the most flammable material in each spot.

So California and Washington had early cases. The Northeast was hard hit. Then things seemed tosubside for a bit, but there were warning cases in meat packing and nursing homes, etc. 

Then things moved south and west, as the networks hooked up to the vulnerable.  This is my explanation for California as well--the first wave there was the mobile upper class, the new wave is hitting Latinos and African Americans.

There's been a learning curve, particularly in the health professions, so we're in better shape thanwe were on May 1, though we now realize we weren't in as good shape as we thought then.