Rapid chromatographic immunoassays detect both IgG/IgM antibodies to COVID- 19.
IgM antibodies are produced when one becomes infected with the COVID-19 virus, even before developing symptoms. They typically rise within a few days of initial infection. IgG antibodies appear about 14 days after infection, and may remain present for several weeks or even months.
IgG/IgM antibody detection evidences viral exposure and can provide a better idea of the stage of the infection. This information not only helps treatment of individual cases, but allows to track the disease as it moves through the population.