Pathogenic bacteria such as pneumococcus invade the human blood circulation and grow and multiply within it or produce toxins, causing severe symptoms of lung infection or toxicity. The septic bacteria are the most common. The common features of septic inflammation, namely redness, swelling, heat, pain and dysfunction. So, how is septic lung infection examined? The following are the examination methods of septic infection of the lung: 1. blood routine: white blood cells are often in the range of 10-30 thousand, often with increased neutrophils and toxic particles, while infectious atypical pneumonia (SARS) white blood cells are often below 10 thousand. 2, serological examination: Legionella pneumonia PCR positive, mycoplasma pneumonia condensation set at 1:32 or more. 3, sputum examination: is the first step to establish the cause of the disease, requiring sputum specimens in the early morning after brushing teeth and rinsing mouth, the second sputum from the god can not be out, requiring the two hours to send for examination. 4, No sputum can be nebulized inhalation, cricothyroid membrane puncture, CT-guided flying puncture biopsy fire fibrous border brush, TBLB, alveolar lavage. 5.Culture of pleural fluid or blood culture.