This is caused by Mycoplasma pneumoniae, the only mycoplasma definitely pathcgenic to man. The clinical picture resembles bacterial pneumonia although cough and sputum are absent in one-third of cases.

• 病因为肺炎支原体,是能使人致病的唯一支原体。临床表现类似细菌性肺炎,但/患者可不咳、无痰。