过客病毒（Passenger virus）：是一种经常在病变组织（如肿瘤组织）中发现的病毒，但是这种病毒并不是导致这种疾病的原因。
或许HIV只是一个过客病毒。(不引起疾病)，这个过客利用了免疫系统因其他因子而起的缺陷？
Perhaps HIV was merely a passenger that took advantage of an immune system weakened by another cause?
通过客观刻苦地调研，沃顿破除社交，病毒和网络营销之神话。
Wharton Dispels Myths of Social, Viral and Online Marketing through Cold Hard research.
也许HIV病毒仅仅个过客，而造成免疫系统衰弱的真凶另有其人？
Perhaps HIV was merely a passenger that took advantage of an immune system weakened by another cause?
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