Chinese Hospital Acquired Pneumonia Collaboration Network: Epidemiology, Diagnosis and Treatment

Inclusion Criteria: 1. Age ≥ 18 years old. 2. Meets the clinical diagnostic criteria for HAP in the 2018 HAP/VAP guidelines. Chest X-ray or CT shows new or progressive infiltrative shadows, consolidation shadows, or ground glass shadows, combined with 2 or more of the following 3 clinical symptoms, to establish a clinical diagnosis: 1) Fever, body temperature\>38 ℃; 2) Purulent airway secretions; 3) Peripheral blood white blood cell count \>10 × 10\^9/L or \<4 × 10\^9/L. 3. Having qualified evidence of responsible pathogen. On the basis of clinical diagnosis, one of the following conditions should be met simultaneously: 1) Qualified lower respiratory tract secretions (neutrophil count \>25/low magnification field, epithelial cell count \<10/low magnification field, or a ratio of the two \>2.5:1), pathogenic bacteria cultured through bronchoscopy anti pollution brush (PSB), bronchoalveolar lavage fluid (BALF), lung tissue or sterile body fluid, and consistent with clinical manifestations; 2) Pathology, cytopathology, or direct microscopic examination of lung tissue specimens showing fungi and evidence of tissue damage; 3) The serum IgM antibodies of atypical pathogens or viruses change from negative to positive, or the titers of specific IgG antibodies in both acute and recovery phases show a 4-fold or more change. During the outbreak of respiratory viruses and with a history of epidemiological contact, respiratory secretions were tested positive for corresponding virus antigens, nucleic acid tests, or virus culture. 4. obtained informed consent Exclusion Criteria: 1. Those who cannot understand and execute the investigation plan. 2. Active pulmonary tuberculosis; 3. Severely immunosuppressed patients: absolute neutrophil count \<0.5× 10\^9/L, CD4\<200/ml.