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.
This trial is aimed to study the immunological and pathological characteristics of influenza versus non-influenza severe community-acquired pneumonia patients in ICU.