The goal of treatment is to lower HIV levels to help the immune system renew itself and keep people healthier longer, in part to stem the spread of the virus.

治疗目标是降低艾滋病毒水平，以帮助免疫系统的自我更新，并保持人民较长的健康，部分原因也是为了阻止病毒扩散。

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"Most businesses appear to have Conficker under control," he said. "They've applied patches and updated their anti-virus software to stem the spread of the worm."

大多数公司看来Conficker已得以控制“他说道，”他们给软件打好了补丁，升级了防病毒软件以遏制蠕虫的传播。

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The government has even explored the possibility of closing schools to stem the spread of the virus.

VOA: standard.2009.07.31

In 1997, before he was charged, authorities in the western New York city of Jamestown took the unusual step of announcing publicly that Williams was HIV positive in an effort to stem further spread of the virus by Williams' partners to others.

WSJ: Lawyer: NY man at center of HIV scare not positive