Mycoplasma and Chlamydia are flora that normally exist on the body and can multiply when the body’s immune system decreases. Common tests include: first, blood work, which will show a generally normal peripheral blood white blood cell count and increased eosinophilia. Second, the doctor will find in the chest X-ray that the patient’s lungs show atypical pneumonia, which usually manifests as unilateral stage pneumonia, and in severe cases, the lesions are extensive and even spread to both lungs. Third, the secretion examination, take sputum or respiratory mucosa specimens to do smear for examination. Fourth, the blood mycoplasma, chlamydia antibody test. Fifth, chlamydia isolation test.