At CDC quarantine sites they serial tests until two negative PCRs... and this was the standard for release of quarantine in most areas of US until they ran out of tests/testing capacity. A false positive would have quickly stood out.
So for false positive filtering, inclusion criteria is being sick. So we tested for other causes to avoid as well.
Usually we are testing for strep peumoniae and legionella in sick patients. We were doing RVP on anyone we tested for COVID. Then the RVP was having delayed TAT so we just did Flu AB RSV PCR unless sick enough to admit... but now we are literally running out of flocked nasal swabs for NP samples and the state doesn't want throat anymore.
We aren't testing anyone who isn't hospital sick because we can't. And we are still seeing 4-5 day TAT, can't even get priority for ICU patients
The testing situation is an absolute disgrace
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