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8:06 AM 4/2/2020 - Corona Is NYC's Epicenter Of Coronavirus Outbreak | The question is : Were the different strains or sub-strains with varying degrees of virulence introduced in different places (about simultaneously?) from the beginning? This does not presuppose the mutation in the process of the epidemics.

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https://fbinewsreview.blogspot.com/2020/04/806-am-422020-question-is-were.html




"Since scientists are pretty sure the virus isn’t mutating very quickly, the pathogen itself shouldn’t be more deadly in one place than another. So why the variation?"

The stark differences in countries’ coronavirus death rates, explained
Italy’s case fatality rate is 10 times higher than Germany’s. Learning why could help save lives.

M.N.: However, the question is : Were the different strains or sub-strains with varying degrees of virulence introduced in different places (about simultaneously?) from the beginning? This does not presuppose the mutation in the process of the epidemics. 
The rates of illnesses and deaths are very different from country to country, including those in the same geographical areas and with the similar cultures and healthcare systems. 
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