1. What is the difference between the diagnosis of mycoplasma pneumonia and bacterial pneumonia? The cough is usually more sputum, can have yellow sputum, check the blood routine total leukocytes and CRP simultaneous elevation, also predominantly neutral, sputum culture more bacterial growth, intra-pulmonary lesions are mainly solid. 2.What are the most common tests to diagnose mycoplasma pneumonia? Currently, the main ancillary tests are mycoplasma antibodies in blood or alveolar lavage fluid. 3.What are the symptoms found during the consultation that require high suspicion of mycoplasma pneumonia? School-aged children with persistent fever, irritating dry cough, lesions in the lungs, low blood leukocytes, and mild to severe elevation of CRP. 4. What would be the indicators to suspect in routine blood tests? Routine blood tests are not specific for the diagnosis of mycoplasma pneumonia. 5.What is the antibody titer for immunoassay that can be diagnosed? A serum mycoplasma antibody titer greater than 1:80 should be considered as a possible mycoplasma infection, and a 4-fold increase in titer after a dynamic recheck will confirm the diagnosis. 6.What are the results of chest X-ray examination for diagnosis? Chest radiography is not specific for the diagnosis of mycoplasma pneumonia. 7.If parents are worried about radiation and do not want to do chest X-ray, does it affect the diagnosis of the disease? The amount of radiation in chest radiographs is within the acceptable range for medical examinations, and generally does not affect the child too much. 8, mycoplasma antibodies appear time. The human body is infected with Mycoplasma pneumoniae, can produce specific IgM and IgG class antibodies. IgM class antibodies appear early, generally in the first week after infection, 3 to 4 weeks to reach a peak, and then gradually reduced. Since the incubation period of Mycoplasma pneumoniae infection is 2 to 3 weeks, IgM antibodies have already reached a fairly high level when patients present with symptoms and seek medical attention, so a positive IgM antibody can be used as a diagnostic indicator for acute phase infection. If the IgM antibody is negative, then the Mycoplasma pneumoniae infection cannot be denied and the IgG antibody should be detected; IgG appears later than IgM and needs to be observed dynamically; if it is significantly higher, it indicates recent infection, and if it is significantly lower, it indicates late infection.