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No Test is Perfect

  • Writer: Richard Bennett Ph.D.
    Richard Bennett Ph.D.
  • Aug 21, 2020
  • 1 min read

√ There will always be false negatives and false positives.

√ The concern with COVID testing is what proportion are false negatives.

In a large population ie. 50,000, even 1% false negatives infers great risk.

√ The blue line on the graph depicts the probability of a true positive nasal test.

The virus detection rate increases as the day of first symptoms approaches.

Then declines over the course of many weeks.

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