Archive for June 11th, 2021

“Pandemics naturally thrive most in big cities”

June 11, 2021

So, don’t paint suburban and rural locales with the same herd immunity paintbrush.

In a post earlier this week post, we concluded:

Covid transmissibility is, in the final analysis, a local dynamic.

So, a national vaccination rate may be an interesting barometer, but it’s not determining.

Said differently, some communities will likely reach the herd immunity threshold, even if the entire United States does not. Source

Specifically, viral spread in dense urban areas has little relevance to sparsely populated rural areas.

To provide some added context to that last point, let’s flashback to one of our early-on covid posts …

Originally posted April 6, 2020

Previously, we recapped the IHME Murray Model — the coronavirus forecasting model that was foundational to the Coronavirus Task Force’s thinking.

The model’s developers make clear that the model does not consider either population density, household size or the utilization of public mass transit.

In other words, it doesn’t consider the effect of urbanization.


I expect that the model will be refined to consider the urbanization variable since Dr. Birx keeps saying “we’ll be drilling down to the county level” …  and since some pandemic historians note that pandemics naturally thrive most in big cities.

Here’s what they’re talking about…