The present invention provides {TAIL ~ an attenuated virus}, which is derived from Modified Vaccinia Ankara virus and characterized by the loss of {HEAD ~ its capability} to reproductively replicate in human cell lines 
The present invention provides { TAIL ~ an attenuated virus } , which is derived from Modified Vaccinia Ankara virus and characterized by the loss of { HEAD ~ its capability } to reproductively replicate in human cell lines
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