当志愿者们不洗手时，大部分病毒一个小时之后仍然存在。
When volunteers didn't clean their hands, most of the virus was still present an hour after exposure.
科学家发现，一些人的免疫系统只能识别部分病毒，而不是全部。
Scientists found that some people's immune systems could recognise parts but not all of the virus.
当病毒再次感染时，这群细胞能增殖并迅速动员起来，产生绝大部分病毒。
When the virus re-infection, the proliferation of these cells and rapidly mobilized to produce the vast majority of the virus.
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