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猪流感的传染速度和范围离WHO的六级警戒线越来越近了

kira86 于2009-06-10发布 l 已有人浏览
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WHO Close to Declaring Flu Pandemic 世卫公布的对6个不同“流感大流行级数”的定义如下:第一级:病毒在动物间传染,但没
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WHO Close to Declaring Flu Pandemic




世卫公布的对6个不同“流感大流行级数”的定义如下:

第一级:病毒在动物间传染,但没有传出人类感染病例。
第二级:已知一种动物流感病毒在人类造成感染,因此被视为潜在大流行威胁。
第三级:有动物流感病毒或动物与人类流感重组病毒造成零星或小规模的人类传染,但这种人与人之间传染还不足以造成社区感染。
第四级:动物流感病毒或动物与人类流感重组病毒造成的人与人间传染,足以造成社区传染。大流行风险骤升。本级重点在于控制病毒蔓延。
第五级:人与人之间传染在同一地区蔓延到至少两国。强烈显示即将发生大流行。
第六级:大流行级。人与人之间病毒传染,在同一地理区至少在两国传播,并扩散到同一区的另一个国家。

This is the VOA Special English Health Report.

As of Tuesday, seventy-three countries had reported more than twenty-six thousand cases of the new H1N1 flu virus. A World Health Organization official, Keiji Fukuda, said these confirmed cases included two hundred forty-nine deaths.

Doctor Fukuda, the agency's top flu expert, says the virus continues to spread in North America. And there are increasing reports from South America as well as from other southern countries. 

Australia has had more than one thousand cases, the largest number outside North America. The state of Victoria has been most affected.

But the United States has had by far the most confirmed cases. More than thirteen thousand were reported as of Monday, including twenty-seven deaths.

The H1N1 outbreak began in Mexico in March. Mexico has reported more than one hundred deaths. An unusual number of flu cases have been found in young people who were otherwise healthy.

The W.H.O. has an influenza warning system in which phase six means that a pandemic is taking place. In recent days the United Nations agency has moved closer and closer to such a declaration.

As of Tuesday officials had not yet announced a change from phase five. But Doctor Fukuda said the public should understand what a pandemic means.

KEIJI FUKUDA: "By going to phase six, what this would mean is that the spread of the virus is continued and that activity has become established in at least two regions of the world. It does not mean that the severity of the situation has increased or that people are getting seriously sick at higher numbers or higher rates than they are right now."

Doctor Fukuda, an acting assistant director-general, said the W.H.O. has been working with the member states to prepare for a pandemic. Scientists are working on vaccines to protect against the new virus. Governments have been gathering supplies of anti-viral drugs.

But public health officials have also had to consider the risks if the public overreacts to a pandemic declaration. Doctor Fukuda pointed out that hospitals might quickly fill with people who are worried but not especially sick. Then hospitals might not be able to care for other patients who really do need help. 

The last flu pandemic was in nineteen sixty-eight, caused by the so-called Hong Kong flu. Scientists say the common name for the new disease, swine flu, is misleading. The virus combines human, bird and pig viruses. But, as Doctor Fukuda pointed out, eating meat from pigs has not been a danger.

And that's the VOA Special English Health Report, written by Caty Weaver. For more health news, go to en8848.com.

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