过去，相似的研究由于在肝组织内直接观察和明确感染过程很困难而受到阻碍。
In the past, similar investigations have been hampered by the difficulty of identifying and observing directly the infection process within live tissues.
到目前为止，科学家们几乎没有该药物在防止更严重的感染后果的功能的明确证据。
Until now scientists had very little clear evidence about the drug's role in preventing more serious effects of infection.
尽管大多数情况下医生并不知道明确的病因，但是癫痫和脑损伤、肿瘤或者感染相关。
Although in many cases doctors don't know what causes it, epilepsy can be related to brain injury, tumors, or infections.
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