In previous avian influenza outbreaks, such as SARS and H5N1 [10, 11, 14] , CXR has been shown to be useful in the prognostication of the disease. According to the authors' clinical and radiological observation of the Influenza A(H1N1), serial CXR revealed that lung infiltration increases with progression of the disease. This is similar to the findings of Ajlan et al where alveolar infiltration was predominant in cases that progressed to ARDS and showed near complete to total resolution in clinically resolving cases [14] .