Mycoplasma pneumoniae igG antibody is an immunoglobulin, which suggests that the body has been infected with Mycoplasma pneumoniae. It is necessary to combine the symptoms and whether the Mycoplasma pneumoniae igM antibody is positive or not to clarify whether there is a recent infection. When the body is infected with Mycoplasma pneumoniae, it acts as an antigen that stimulates the body to produce antibodies against Mycoplasma pneumoniae, i.e., immunoglobulins. igM antibodies are the first to appear, and their positivity suggests that there is a recent infection, whereas a positive igG antibody suggests that there has been an infection with Mycoplasma pneumoniae, and it does not confirm that the body is currently being infected. If abnormal symptoms such as cough and fever are present and igM antibodies are positive, this suggests a recent infection and requires active treatment. Therefore, when Mycoplasma pneumoniae igG antibody is positive, it is necessary to combine the presence of symptoms, and igM antibody is positive or not to make a comprehensive judgment, if the organism is being infected with Mycoplasma pneumoniae, then under the guidance of the doctor active treatment.