[Leica] Nathan's PAD 14/3/2020: ghost town

[Brian Reid]

> I saw a US map this morning with the infection numbers.  It does not 
> take a
> genius to tell that EACH of the centers of infection are the same as 
> major
> airports.

True, but major airports are all built near major cities. It's the 
population centers that are the problem. Each time you add one person to 
a population, that gives one more possible host and one more possible 
victim for infectious spread. That means that the probability of disease 
growth is proportional to the square of the population. So larger cities 
will have more cases, and will also have bigger airports. I don't 
believe there is any reliable data on how much airports are involved in 
the spread of this disease.