claim: low-term persistence of igg antibodies in sars-cov infected healthcare workers
evidence_1: igg titers in sars-cov-infected healthcare workers remained at a significantly high level until 2015.", "all sera were tested for igg antibodies with elisa using whole virus and a recombinant nucleocapsid protein of sars- cov, as a diagnostic antigen.", "conclusions igg antibodies against sars-cov can persist for at least 12 years.")