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| Passenger virus ： ウィキペディア英語版 |
Passenger virus
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）』
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