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