Sensitization to severe dengue illness through pre-existing immunity is a serious safety concern for vaccination.
免疫接种时的一个严重的安全性问题是由于先前已经存在的免疫性而触发严重登革热。
The H1N1 pandemic was characterized by the emergence of a new influenza virus to which many people had no pre-existing immunity.
H1N 1流感大流行的特点是出现新的流感病毒，而许多人对其并没有预先存在的免疫力。
What we have found is that the swine flu has similarities to the seasonal flu, which appear to provide some level of pre-existing immunity.
我们发现的是，猪流感与季节性流感有相似之处，它可以提供某种之前存在的免疫性。
The method taught herein functions to offset pre-existing immunity through the delivery of the protein or antigen by a cocktail of at least two adenoviral serotypes.
本文所述方法的作用是通过至少两种腺病毒血清型混合物送递蛋白质或抗原，以抵消已有的免疫力。
Whether this reflects the persistence of pre-existing immunity at the time of revaccination or lower rates of revaccination in the study populations cannot be determined.
这是因为再次接种时前次的免疫性仍然存在，抑或是因为在研究人群中再次接种率较低，对此目前尚无定论。
When people have no pre-existing immunity to a flu virus, they need not just one but two doses of vaccine several weeks apart - making it very hard to immunise many people in time to protect them.
当人们对流感病毒没有预先免疫性，他们就需要几周间隔的两次注射而不是一次注射-这在当时免疫接种很多人去保护他们操作是非常困难的。
When people have no pre-existing immunity to a flu virus, they need not just one but two doses of vaccine several weeks apart - making it very hard to immunise many people in time to protect them.
当人们对流感病毒没有预先免疫性，他们就需要几周间隔的两次注射而不是一次注射-这在当时免疫接种很多人去保护他们操作是非常困难的。
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