A positive Mycoplasma pneumoniae antibody IgM mainly indicates the presence of Mycoplasma pneumoniae infection in the body, a strong inflammatory response in the organism and an active phase, which can be treated with macrolides, such as erythromycin, azithromycin and memantin. It is also possible to test for Mycoplasma pneumoniae antibody IgG. With remission and final cure, Mycoplasma pneumoniae antibody IgM will turn negative, suggesting cure. Mycoplasma pneumoniae antibody IgG can remain positive and simply indicate a previous infection with Mycoplasma pneumoniae. Diseases caused by Mycoplasma pneumoniae infection can include upper respiratory tract infections, bronchitis, pneumonia, etc.