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An experimental drug had no effect in general in the first major test of a vaccine to prevent AIDS. 在首次防治艾滋病的疫苗试验中，实验药物总体来讲没起到作用。
A Vaccine To Prevent AIDS? 用疫苗真的能够预防艾滋病吗?
Is there a vaccine to prevent this new infection? 问：是否有疫苗阻止这个新的传染病。
For more than 20 years, scientists have been trying to develop a vaccine to prevent H.I. 20多年以来，科学家们就一直努力研制一种可以预防爱滋病病毒感染的疫苗。
For more than 20 years, scientists have been trying to develop a vaccine to prevent H.I.V. infection. 20多年以来，科学家们就一直努力研制一种可以预防爱滋病病毒感染的疫苗。
For more than twenty years, scientists have been trying to develop a vaccine to prevent H.I. 20多年来，科学家尝试开发一种预防HIV感染的疫苗。
For more than 20 years,scientists have been trying to develop a vaccine to prevent H.I. 二十多年来，科学家们一直努力研制预防艾滋病毒感染的疫苗。
For more than twenty years, scientists have been trying to develop a vaccine to prevent H.I.V. infection. 二十多年来，科学家们一直努力研制预防艾滋病毒感染的疫苗。
For more than twenty years, scientists are having have been tring to develop biofecsin a vaccine to prevent HIV infection. 报告中表示，如果政府能每年在每人身上投资至少3分美元，这个防治计画就会有效。
Research also continues on a vaccine to protect against the virus. 目前还在继续研究疫苗,以防病毒。
At the same time, 21 codons defined firstly as ‘optimal codons' might provide more useful information for the expression of target genes and development of a vaccine to prevent glanders. 以上结果对鼻疽伯克霍尔德氏菌的密码子用法研究、在分子水平上研究物种进化、基因组中未知基因的预测、开放阅读框的判断、功能基因的表达以及鼻疽病疫苗的研发等工作都提供了理论基础,具有较强的指导作用。
Health experts say a new vaccine to prevent TB is very important. 专家说研制出一种预防结核病的新疫苗非常重要。
One was the ability of the vaccine to prevent H.I.V. infections. 一个是防止艾滋病病毒感染的疫苗性能测试。
In addition, there is no vaccine to prevent this new H1N1 virus. 此外，目前还没有疫苗，以防止这种新颖的H1N1病毒。
A vaccine is the best hope to prevent millions of deaths. 这种疫苗将可望避免上百万死亡病例的产生。
A new study says Asia must do more to prevent AIDS, or the number of people infected with H. 一项新的研究显示，亚洲必须为预防艾滋病作出更多措施，否则感染H.
A new study says Asia must do more to prevent AIDS, or the number of people infected with H. I. V. could double by 2020. 一项新的研究称亚洲必须采取更多行动以防止爱滋病，否则到2020年感染爱滋病毒的人数将会翻一番。
A: We must prevent AIDS from spreading. 我们必须防止艾滋病的漫延。
The AIDS epidemic sharply underscores men’s critical role: In the absence of a vaccine or cure, changes in male behaviour are central to preventing its further spread. 艾滋病的流行明确地提出了男性的重要作用：在缺少疫苗或治疗的情况下，男性行为的变化对于防止进一步扩散是重要的。
Haemorrhage heats up vaccine to be able to prevent epidemic haemorrhage heat. 出血热疫苗可预防流行性出血热。