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This stuff is common sense. You really don't need any sort of high educational level to know if you want to stop a virus from passing through the air and on surfaces you shut down everything and treat the people you know have it. If not all you are doing is risking spreading the virus.
I don't think any society on Earth has ever tested every single person for a virus. It's impossible. And even if you can, just because you test and a person comes back negative doesn't mean when they leave they won't come into contact with someone who has the virus.
Shut down is how China slowed and seemingly stopped the virus for now. Italy is shut down. The United States just went from groups of 250 down to groups of 10. We are playing around.
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