Disease

Coverage of infectious and chronic diseases — their causes, mechanisms, epidemiology, prevention strategies, and the latest science on how the body fights back.

“Blindness separates us from things but deafness separates us from people.” Helen Keller
Perhaps that last line is a bit of self-reflection, and "we" is just me.
This type of study is referred to as ecologic since it is based on locations (counties) rather than individual patients.
But what happens if the cancer does not fall into one of the two known causes of cancer, heredity or the environmental/lifestyle factors?
COVID-19 has already broken all the rules.
I’ve written about the impact of climate, global or local, on the transmissibility of COVID-19 on several occasions, e.g., here and 
We constructed a comparison “rural” dataset by subtracting the urban case and death counts from the state totals to assess urban-rural differences.
COVID-19 vaccines are the miracle that has significantly suppressed the pandemic in a number of countries, including the United States, where the current seven-day moving averages of 
Why it may seem a bit like knowing the number of angels dancing on the head of a pin understanding the relative amounts of virions and viral particles responsible for COVID-19 will provide some insights into “pandemic dynamics” and our immune resp