伟哥最初是开发用来治疗高血压和心绞痛的，但是参与初期试验的男性发现该药物有着有趣的副作用。
Viagra was originally developed as a treatment for high blood pressure and the heart condition angina, but men who took part in early trials realised the drug had an interesting side effect.
他们在肯尼亚西部的萨乌里的一个模范村落里进行了试验，那里住着的三分之二的罗部落人民每天花销还不到1美元，而初期试验结果让人惊喜不已。
The early results of Kenya's prototype village, in Sauri in western Kenya, where two-thirds of the people, Luos, live on less than $1 a day, are astonishing.
利用这一试验，在疾病晚期所采血液样本中抗体水平比疾病初期所采样本中发现的抗体水平至少高4倍时作出确定的诊断。
Using this test, a positive diagnosis is made when antibody levels in a blood sample taken late in illness are at least four times higher than those found in a sample taken early in illness.
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