Figure 2From: The value of radiographic findings for the progression of pandemic 2009 influenza A/H1N1 virus infection The patients’ clinical courses after admission based on the chest radiographic findings. All patients who required mechanical ventilation were admitted to the intensive care unit. Group 1: normal, Group 2: hilar and/or peribronchial markings alone, Group 3: consolidation, Group 4: others.Back to article page