Dr Birx - HALF of Covid POSITIVE tests may be FALSE (and CDC now admits ...

"Dr Birx - HALF of Covid POSITIVE tests may be FALSE (and CDC now admits it)...IF PREVALENCE IS LOW"

• The Centers for Disease Control has updated its guidance warning that antibody tests for COVID-19 may be wrong up to half of the time
• It urges caution as false positive results could lead people to believe they have an immunity to coronavirus
• The inaccuracy is caused by how uncommon the virus is within the population
• If the infection has affected only a small number of people tested, it will have a magnified margin of error
• Even a test with more than 90 percent accuracy can still miss half the cases if only five percent of the population has been infected, it warns 
• The CDC has said  patients may need to be tested at least twice
• The test results should also not be used for policy-making decisions, it adds

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