Unfortunately, primary prevention trials that start in childhood would be lengthy, expensive, and logistically nearly impossible, "said Ulrich and Potter."

不幸的是，从童年开始的早期预防试验时间冗长、花费巨大和在后勤上几乎是不可能的。Ulrich和Potter如是说。

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However, the second-with a 0.5% formulation-was supported by the results, published in February, of a smaller trial run by the HIV Prevention Trials Network.

但是PRO2000成分占0.5%的第二组，包括HIV预防实验网络进行的较小型实验，支持2月发表的实验结果。

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"Is aspirin really that good or is there some other explanation for the findings that differ so much from those of the WHS and other primary prevention trials?" he asked.

他问到：阿斯匹林真的这么好还是有其它的原因，使这次的发现与世界健康调查和其它的一期预防实验的结果差距这么大？

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In these trials of primary prevention, the reduction in non-vascular deaths accounted for almost all (91%) of the deaths prevented.

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The data from both less-reliable observational studies and clinical trials was conflicting, and Merck began three big cancer prevention studies that could also assess any risk Vioxx caused to the heart.

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Then, two months ago, the NIAID signed another agreement to fund clinical trials of VivaGel aimed to study its application for genital herpes prevention.

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