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The emergence of viral infectious diseases in recent years has posed great public health concern worldwide.For example,flu continues to be a major cause of mortality worldwide and highly pathogenic MERS-CoV infection occurred in 2012 in Middle East.Recently,a novel Ebola virus (EBOV) first identified in March 2014 has caused more than 25,000 human infections in West Africa,resulting in more than 10,000 deaths.