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A passenger virus is a virus that is frequently found in samples from diseased tissue, such as tumours, but does not contribute to causing the disease. ==Experimental demonstration of passenger status== Proving that a virus has no causative role can be difficult. Although none of the following signs is definitive, evidence that a virus found in diseased tissue is a passenger rather than a causative agent includes: *injection of the virus into healthy animals without causing disease; *the absence of the virus at the earliest stages of the disease; *curing the viral infection using antiviral drugs or vaccination with no effect on the course of the disease. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「passenger virus」の詳細全文を読む スポンサード リンク
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