圣保罗国际机场发现脊髓灰质炎病毒样本_社会生活

圣保罗国际机场发现脊髓灰质炎病毒样本

文章来源：未知文章作者：enread 发布时间：2014-06-24 07:52 字体： [大中小]　进入论坛

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A strain of the polio virus has been found at an international airport in Brazil, but there are no human cases, the World Health Organization has said.

世界卫生组织宣称，脊髓灰质炎病毒的一个变种已在巴西国际机场被发现，但尚未发现人类感染案例。

A WHO statement released on Monday said the virus was found in samples taken from sewage at Viracopos International Airport in Sao Paulo state in March.

It said the local population's high immunity¹ to the disease "appears to have prevented transmission".

Brazil has been polio-free since 1989 and has high vaccination² coverage³.

The virus was found in "sewage only" and subsequent analysis of similar samples have either been negative or only positive for "non-polio enteroviruses", the organisation⁴ said.

The WHO said the sample was a close match with a recent strain isolated⁵ in a case in Equatorial Guinea.

The risk of the polio virus spreading from Equatorial Guinea is described as "high" by the UN agency, but it said the risk from Brazil remained "very low".

Polio invades the nervous system and can cause irreversible paralysis⁶ within hours. There is no cure for the disease but it can be prevented by immunisation.

Brazil's last national immunisation campaign was conducted a year ago and coverage in Sao Paulo state has been higher than 95%, the WHO said.

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收听单词发音

1 immunity
n.优惠；免除；豁免，豁免权
参考例句：
The law gives public schools immunity from taxation.法律免除公立学校的纳税义务。 He claims diplomatic immunity to avoid being arrested.他要求外交豁免以便避免被捕。

2 vaccination
n.接种疫苗，种痘
参考例句：
Vaccination is a preventive against smallpox.种痘是预防天花的方法。 Doctors suggest getting a tetanus vaccination every ten years.医生建议每十年注射一次破伤风疫苗。

3 coverage
n.报导，保险范围，保险额，范围，覆盖
参考例句：
There's little coverage of foreign news in the newspaper.报纸上几乎没有国外新闻报道。 This is an insurance policy with extensive coverage.这是一项承保范围广泛的保险。

4 organisation
n.组织，安排，团体，有机休
参考例句：
The method of his organisation work is worth commending.他的组织工作的方法值得称道。 His application for membership of the organisation was rejected.他想要加入该组织的申请遭到了拒绝。

5 isolated
adj.与世隔绝的
参考例句：
His bad behaviour was just an isolated incident. 他的不良行为只是个别事件。 Patients with the disease should be isolated. 这种病的患者应予以隔离。

6 paralysis
n.麻痹(症)；瘫痪(症)
参考例句：
The paralysis affects his right leg and he can only walk with difficulty.他右腿瘫痪步履维艰。 The paralysis affects his right leg and he can only walk with difficulty.他右腿瘫痪步履维艰。

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