Influenza A pandemic (H1N1) 2009 virus infection.

The clinical spectrum of the 2009 pandemic influenza A (H1N1) infection ranged from self-limited mild illness to progressive pneumonia, or even a fatal outcome. We summarize the clinical manifestations, risk factors for severe and fatal cases, pathologic findings and treatment of this disease in this paper based on current reports from different regions of the world. Chin Med J 2011;124(20):3399-3402