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IgM antibodies are the first type of antibodies produced by the immune system in response to an acute infection. When IgM against Mycoplasma pneumoniae is present, it generally indicates a recent or ongoing infection. These antibodies appear within 1–2 weeks of exposure and usually decrease after a few months. Testing for IgM is helpful in identifying the early stage of a Mycoplasma pneumoniae infection, especially in symptomatic individuals.

It indicates a recent or current infection with Mycoplasma pneumoniae.
Yes, especially during the early stages of infection or when symptoms are mild or unusual.
Typically within 1 to 2 weeks after exposure.
It can continue for weeks or several months even after the symptoms have improved.
