"Three reasons a negative coronavirus test doesn’t necessarily mean you’re not infected" 
"Rampant community transmission of the coronavirus and a crippled vaccine rollout have boxed people into a corner: Many are relying on negative test results, inherently limited in usefulness, as a certificate of clearance to see family and friends.
While testing is critical to containing the outbreak, a negative test result is not a free pass to forgo social distancing, mask-wearing and other mitigation measures. Here are a few reminders about what a negative coronavirus test means and doesn’t mean."
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https://www.washingtonpost.com/health/2021/01/13/false-negative-covid-test/
  
  
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