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What is your COVID-19 testing IQ?

The three types of COVID-19 testing are PCR (molecular) tests, antigen tests, and antibody tests.
The gold standard test for COVID-19 diagnosis is:
The only test that can confirm a past COVID-19 infection is:
A PCR test is required to confirm a negative antigen test result for a SYMPTOMATIC (with symptoms) person.
A PCR test is required to confirm a negative antigen test result for an ASYMPTOMATIC (without symptoms) person who has no known exposure to the virus.
Which type of COVID-19 test is most commonly used to detect possible prevalence of COVID-19 within a population?