Weak positive Mycoplasma pneumoniae generally refers to weak positive Mycoplasma pneumoniae antibodies. The commonly used clinical antibodies to Mycoplasma pneumoniae are mainly IgG and IgM antibodies, suggesting possible infection with Mycoplasma.
1. IgG antibody: there may be cross-reactivity with other mycoplasmas, and its clinical application is not as extensive as that of IgM antibody. Weak positivity suggests a possible previous infection, and generally requires an antibody titer of ≥1:32, or collection of double sera in the acute and recovery phases with more than a 4-fold elevation in titer, to suggest a recent infection. If IgM antibody is negative and IgG antibody is positive, it indicates previous infection.
2. IgM antibody: It is the earliest specific antibody to appear after mycoplasma infection, and positive results can be seen 1~2 days after the onset of the disease, so it is conducive to early clinical diagnosis. Antibody titer ≥1:64, or more than 4-fold elevation is one of the reference bases for the diagnosis of mycoplasma pneumonia. Weak positivity may be early onset, severe disease or reinfection, but the antibody is not the gold standard for diagnosis, and needs to be analyzed in combination with clinical symptoms.
It is recommended to consult a regular hospital in case of discomfort, and not to use medication on your own to avoid delaying your condition.