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GICA and ELISA were used to detect SARS-CoV-2 IgM in 86 serum samples, including 5 influenza A virus (Flu A) IgM-positive sera, 5 influenza B virus (Flu B) IgM-positive sera, 5\n            <jats:named-content content-type=\"genus-species\">Mycoplasma pneumoniae<\/jats:named-content>\n            IgM-positive sera, 5\n            <jats:named-content content-type=\"genus-species\">Legionella pneumophila<\/jats:named-content>\n            IgM-positive sera, 6 sera of HIV infection patients, 36 rheumatoid factor IgM (RF-IgM)-positive sera, 5 sera from hypertensive patients, 5 sera from diabetes mellitus patients, and 14 sera from novel coronavirus infection disease 19 (COVID-19) patients.\n          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