Right up front I have to say I haven’t practiced epidemiology for half a century. But I was trained by Dr Alexander Langmuir at CDC when I was an MD officer in the USPHS, and I did epidemiological field work on measles, which was a major cause of death in children in urban and rural West Africa, and smallpox.
Analyzing a disease is like analyzing any sick patient and getting to a diagnosis. Individual diseases spread in many different ways: from leprosy (close longer term physical contact); HIV/AIDS (sexual or needle contact); malaria (mosquitoes); rodents (plague); many GI diseases (fecal-oral contamination); airborne (influenza and many viruses); and many more diseases and modes.
Covid-19 appears to be largely, although not exclusively, spread via the GI tract rather than as an airborne pathogen like influenza. So the epidemiology is quite likely different. At very short distances from an ill person who is coughing, one could inhale enough Covid-19 virus to become infected, but I see that not being the major route of spread.
Therefor cultural differences and occupational differences will determine infection rates and illness rates far more than with influenza.
Poor sanitation and “touchy-feely” cultural or personal habits primarily will determine spread rates and infection rates and hence numbers of deaths.
Frequent hand washing, cooking your own hot food, avoiding kissing as a normal greeting, and maintaining some space from other people in public should go a long way in reducing the disease and its spread.
I think most writers on the subject I have read, and I have certainly NOT seen them all. are not competently trained epidemiologists and are therefor overestimating morbidity and mortality rates and time rate of spread.
Now, it’s possible that the major modes of infection noted to date may be proven wrong, but probably not in my opinion.
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