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Message: [QUOTE="MCC, post: 3770837, member: 145"] Both PCR and antigen tests show active infection. Antibody tests detect Abs your body has produced, which indicates past infection (although one could have a 'dormant' carrier status; we just don't know enough about SARS CoV2). The antigen test detects viral proteins, and deploys antibody reagents to do so. PCR is much more sensitive but less specific than antigen, so risk of false +ves is higher with the former. Hope this is useful context, and to all: stay safe and stay well. [/QUOTE]