Influenza Associated Aspergillosis In-depth Investigation

This trial is aimed to study the immunological and pathological characteristics of influenza versus non-influenza severe community-acquired pneumonia patients in ICU, and correlate findings with occurrence of secondary invasive pulmonary aspergillosis infection. All consecutive patients aged 18 or older admitted to ICU during the inclusion period with respiratory distress due to influenza positive/negative community acquired pneumonia (CAP) will be included.