P5‐2: Intrathoracic vacuum‐assisted closure therapy for the management of acute lung abscess

claims database was used. All patients who developed influenza during two consecutive epidemic seasons from 2017 to 2019 were analysed. CP was defined as bacterial pneumonia diagnosed between three days prior to and 6 days after the diagnosis of influenza. SP was defined as that between day 7 and day 30. Multivariable logistic regression analysis was performed to identify factors associated with the development of CP and SP. Results: Among 10,473,014 individuals registered in the database, a total of 1,272,545 patients with influenza were analysed, with an average age of 26.6 18.5 years. 2,209 (0.17%) and 1,122 (0.09%) patients developed CP and SP, respectively. Age, bronchial asthma, COPD, cardiovascular disease, anticancer drug treatment and immunosuppressant/ immunodeficiency were significant risks for both pneumonias after adjustment, whereas neurological disorder, liver disease, diabetes, malignant tumour were risks specific to CP. Conclusion: Factors associated with the development of both CP and SP and those specific to CP or SP were shown.