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1. Negative Result: Only the control line C develops color, neither line G nor M develops color.

2. Positive Results: There are three positive results:

a. Line C and line G develop colors, indicating the sample contains human anti- Coronavirus COVID-19 IgG antibody. This result indicates that the person might have the coronavirus COVID-19 infection in about 2 weeks or longer.

b. Line C and lien M develop colors, indicating the sample contains human anti-COVID-19 IgG antibody. This results indicates that the person might have the coronavirus COVID-19 infection in about 3-5 days or longer.

c. All line C, line G and line M develop colors, indicating the sample contains both human anti-COVID-19 IgG and IgM antibodies. This results indicates that the person might have the coronavirus COVID-19 infection in about 2-6 weeks.

3. Invalid Result: On the test card, other than lines G and M, it also contains a line C (control line). During the test, the line C must be colored when the time to read result. If the control line C doesn't appear, the result is indicated to be invalid, no matter whether line G or line M develops color or not. The sample needs to be re-tested.