Diagnosis of VAP relies on a set of non-specific clinical, biological, and imaging criteria. Understanding host-pathogen interactions and the mechanisms of deregulations leading to infection of pulmonary tissue appears essential. The aim is to qualitatively describe the B lymphocyte populations present in the pulmonary microenvironment of patients admitted to intensive care and requiring invasive mechanical ventilation
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Qualitative description of B lymphocyte populations by flow cytometry analysis with specific antibodies
Timeframe: At the inclusion (T1), at diagnosis (T2 on the day of VAP diagnosis for patient who will develop it, on average 72 hours after the inclusion), at the end of the study (T3 on the day before extubation, on average 5 days after the inclusion)