Hospital acquired pneumonia is the most common infection occurring in patients requiring care in an intensive care unit (ICU), with incidence rate ranging from 6% up to 52%). This increased incidence is due to the fact that patients located in an ICU often require mechanical ventilation and mechanically ventilated patients are 6 to 21 times more likely to develop hospital acquired pneumonia (HAP) than are non-ventilated patients these study was done to assess the diagnosis utility if quantitative culture of EA for diagnosis of VAP.