Internet searches on gastrointestinal symptoms predicted a rise in Covid-19 cases weeks later, researchers at Massachusetts General Hospital found, demonstrating a novel early warning system for hot spots of the pandemic disease.

submitted by Pis-dur from bloomberg.com

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[–]jet199 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

So maybe covid 19 isn't actually asymptotic for a week, it's just the symptoms are different. That's why it can spread during that time. So hand washing was the main protection needed after all.