What does positive serum antibody of COVID-19 indicate? Does it indicate COVID-19 infection

The serum antibody of novel coronavirus is divided into IgM antibody and IgG antibody. So, what is the meaning of positive serum antibody of COVID-19?

Positive serum antibody of COVID-19 What does it mean that positive serum antibody of patients with COVID-19 indicates that patients may be infected with novel coronavirus or traditional virus. The serum antibody of novel coronavirus is divided into IgM antibody and IgG antibody. The positive IgM antibody usually indicates the infection stage, and the positive IgG antibody indicates that the virus has been infected in the past. However, these are not completely absolute. In clinical work, it is found that some patients do not have any symptoms, but have a positive status of serum antibodies. This kind of patients need to be further diagnosed in combination with the patient's novel coronavirus nucleic acid, not just serum antibodies. At present, there is no clear way to reduce the lgm value of COVID-19 serum antibody. After COVID-19 infection, the body will be stimulated to produce igm antibody and igg antibody. The existence of antibody itself has a protective effect on the body. At present, there is no effective way to reduce the antibody concentration or remove the antibody. The igm antibody will gradually disappear over time. Don't worry too much, but the IgG antibody will exist for a long time.