Earlier quoted context omitted.
Yeah but no less dense area stands alone. One person from a more dense area visits a less dense area and we're right back at it.
I am hopeful we can suppress this disease before herd immunity develops in cities. But, once that happens they stop acting like dense areas in terms of disease spread. It’s really a question of regional R factors under various levels of social distancing, population, and herd imminuty.
I have a pet theory that what we're essentially doing is running a huge experiment where we select for the least dangerous strains of the coronavirus. People who get a mild flu or no symptoms at all are less well quarantined and are significantly more likely to pass it on to other people. People who get the worst symptoms are tightly quarantined in hospital, reducing their chances of passing on the worst forms of the virus.
It's probably not true and it isn't really based in any biological knowledge but it kind of makes sense in relation to what I've read about how the Spanish Flu epidemic ended.