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To the editor,1.Introduction to new H7N9 bird flu Influenza virus infection is an important group of respiratory infectious disease.Several groups of influenza viruses can cause human infections.However,in the recent years,there are many newly emerging influenza infections,which have never been previously seen in human.Crossing species from animal to human lead to
To the editor, 1. Introduction to new H7N9 bird flu Influenza virus infection is an important group of respiratory infectious disease. Several groups of influenza viruses can cause human infections. Host, in the recent years, there are many newly emerging influenza infections, which have never been seen in human.Crossing species from animal to human lead to