What Is the Difference Between A PCR Test (Nasal Swab) And an Antigen Test For COVID-19? Topic Guide

What Is the Difference Between A PCR Test (Nasal Swab) And an Antigen Test For COVID-19? What Is the Difference Between A PCR Test (Nasal Swab) And an Antigen Test For COVID-19?: A PCR (polymerase chain reaction) COVID-19 nasal swab test looks for genetic material from the deadly pandemic coronavirus, itself. A positive result means you are infected and should start quarantining. A positive antigen test also means you have an active infection, but this assay looks for protein specific to the virus instead of genetic material.

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