A top priority at present is to prevent the virus from establishing a foothold in densely populated urban or peri-urban parts of the country.

目前一项首要重点是防止病毒在该国人口密集的城市或城郊地区立足。

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Last year's top words were Twitter, Obama and the flu virus H1N1.

去年居于榜首的热词为Twitter、奥巴马和猪流感病毒H1N1。

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From the beginning of the outbreak, the world's top scientists set aside competition and worked together, in a virtual laboratory, around the clock. They identified the virus within a month.

从疫情刚暴发起，世界顶尖的科学家们同心协力，建立了昼夜运转的全球实验室网络，在一个月内就查明了病毒。

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Doctor Fukuda, the agency's top flu expert, says the virus continues to spread in North America.

VOA: special.2009.06.10

This allows the world's top flu experts to study the virus and look for mutations that could make it more dangerous.

NPR: Bird Flu 101: How Bad Is The New H7N9 Strain?

Companies often do not realize that an employee has disabled the anti-virus software or fail to stay on top of available updates, he said.

CNN: Variant of 'I Love You' virus returns

This outbreak, on top of another death last month in Saudi Arabia from a previously unknown virus, a cousin of the Severe Acute Respiratory Syndrome (SARS), has set global health agencies on edge.

ECONOMIST: Where and when will the next pandemic emerge?