来自《耶鲁大学开放课程：生物医学工程探索 第10集 第10集》

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  it affects--it also initiates its infection through the gut.
  它也同样是一种经消化道感染病毒
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  It can be passed from one person to another orally
  可以通过口腔传播途径在人与人之间传播
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  and infects first cells of your intestinal system
  它首先感染肠道系统的细胞
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  and then spreads to other cells,
  之后再感染其他系统的细胞
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  in particular, spreads to cells
  尤其是当病毒感染到
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  that are involved in the neuro muscular junction
  那些构成神经肌肉连接的细胞
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  and can affect then muscle activity
  就会影响到肌肉活动
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  or your ability to move voluntary muscles.
  或者说骨骼肌的运动
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  So, polio--the disease caused
  小儿麻痹症便是由脊髓灰质炎病毒引起的
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  by polio can be a paralytic disease, crippling,
  如果脊髓灰质炎发展到一定程度
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  and in some cases can lead to death
  患者不仅会瘫痪或者残疾
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  if the disease progresses in certain ways.
  一些病例甚至可能死亡