Weak positive for Mycoplasma pneumoniae is due to pediatric infection with Mycoplasma pneumoniae. There are many kinds of chlamydia and mycoplasma in humans, and Mycoplasma pneumoniae is only one of them. Weakly positive means that Mycoplasma pneumoniae invades the human body, but it also needs to be analyzed in conjunction with the clinical analysis of whether there is any damage caused, there is no accumulation of many pathogens to invade the human body, simply weakly positive for Mycoplasma pneumoniae is not yet possible to form a diagnosis of Mycoplasma pneumoniae. If there may be such a situation as a weak positive mycoplasma during a blood test, prompt hospital consultation is recommended. If the positive mycoplasma is coupled with symptoms of fever, cough and sputum, lung auscultation, and chest imaging clarify the presence of mycoplasma pneumonia.