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。
One study showed that pregnant women in the US were more likely to be admitted to hospital with swine flu than other people.
一研究表明，在美国感染猪流感孕妇比其他人有更大可能住院。
A New England Journal study found that pregnant women with swine flu were nine times more likely to be in intensive care.
新英格兰杂志的一份研究发现，孕妇感染猪流感后进入重症监护的可能性要多出9倍。
For the study, CDC researchers used two tests to determine whether antibodies in the blood were active against the swine flu.
在研究过程中，CDC的研究员使用了两种测试方法来测试血液中的抗体能否对甲型流感起作用。
America's other two swine flu deaths — a toddler and a pregnant woman — each suffered from several other illnesses when they were infected with the virus, according to a study released Thursday.
美国的其他两个猪流感死亡-一个三岁的孩子和一名孕妇-被感染了病毒时，每个人都是同时患有几个其他疾病。
Antibodies against some seasonal flu strains from prior years may be active against the new H1N1 swine flu currently circulating the globe, a recent study reports.
近期有研究报道称，早些年对一些季节性流感的抗体可能也可以对抗目前流行全球的甲型H1N 1流感。
Antibodies against some seasonal flu strains from prior years may be active against the new H1N1 swine flu currently circulating the globe, a recent study reports.
近期有研究报道称，早些年对一些季节性流感的抗体可能也可以对抗目前流行全球的甲型H1N 1流感。
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