According to a comprehensive study published in the journal Clinical Infectious Diseases, swine flu had infected only several dozen people in the world since it was first identified in 1930.
从发表在《临床传染病》上的综合研究来看，自1930年确认第一例猪流感传染人类的病例以来，世界上被感染的人只有数十位。
The CDC's study gives one reason why: even if patients go to the doctor to be tested, and not all do, the instant test does not do a good job of detecting swine flu.
疾病控制中心的研究给出一个为什么的原因：即使病人找医生做试验，也不是全部病人都能这样，况且这快速试验测试猪流感效果不佳。
A new study released today by Nature suggests that people alive during the infamous 1918 influenza outbreak have the greatest protection against the current swine flu.
自然杂志今天发表的一篇论文提出经历过臭名昭著的1918年流感大流行的人可能获得了对正在流行的猪流感的免疫力。
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