IgG antibodies are produced later in the immune response and typically indicate previous exposure to Mycoplasma pneumoniae. They usually appear 2–3 weeks after the onset of infection and can remain detectable for months or even years. A positive IgG result does not necessarily signify an active infection but demonstrates that the immune system has encountered the pathogen before. When tested alongside IgM, IgG helps distinguish between acute, recent, and past infections.
It indicates a past or possibly current infection with Mycoplasma pneumoniae.
They can persist for months or even years after the infection.
Yes, many people may have experienced a previous mild or asymptomatic infection.
Testing both helps determine the stage of infection—early, recent, or past.