兴奋剂再次煞了奥运会的风景，又有一名运动员的违禁药物检测结果呈阳性。
Drugs again rained on the Olympics' parade as another athlete tested positive for an illegal substance.
即使在装备最良好的医院，医生也曾报告具有特征明显和几乎相似病况的病人中，仅有部分人的检测结果呈阳性。
Even in the best-equipped hospitals, doctors have reported seeing patients with distinctive and virtually identical disease profiles, yet only some have positive test results.
到目前为止已经有26个国家报告发现了寨卡病毒感染病例，有数十名从寨卡病毒感染区域回国的欧洲人、北美人的检测结果呈阳性。
So far, 26 countries have confirmed cases of the virus, and dozens of Europeans and North Americans returning from Zika-affected areas have also tested positive for the virus.
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