The biggest challenge with treating HIV today is that the virus becomes dormant and often develops resistance to HIV drugs.

在今天，对付HIV最大的挑战就是它潜伏期很长，并且对治疗HIV的药物产生抗药性。

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Of course, a behavior is so popular, just like a virus epidemic, certainly with trigger mechanism or incentive. Then how "Ice Bucket Challenge" spread?

当然，一项行为之所以流行，就跟病毒流行一样，肯定背后有起诱因或者触发机制，“挑战冰桶”是怎么这样传递下去的呢？

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So the biggest challenge for researchers is how the virus is in "sleep" state while using the cocktail therapy to reduce the speed of viral replication.

所以对于研究人员最大的挑战是，如何使病毒处于“休眠”状态，同时使用鸡尾酒疗法降低病毒复制的速度。

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Another challenge is containing the virus's spread within the bird population, researchers say.

WSJ: Hong Kong Steps Up Bird-Flu Measures

"We're working on that challenge, and we hope to introduce a product soon, hopefully before the virus writers get there, " McGee says.

CNN: McAfee aims to shield networks from PDA viruses