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VOA慢速英语2010年-Development Report - Rift Valley Fever

时间：2010-08-03 02:51:55

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This is the VOA Special English Development Report.

Rift1 Valley fever mainly affects farm animals. But the virus can also infect humans, and South Africa has been experiencing an outbreak. The National Institute for Communicable Diseases reported two hundred twenty-five confirmed human cases as of July second. Twenty-five of the people died.

South Africa launched an expanded program to watch for public health threats during the World Cup. Health officials said last week that there were no cases of Rift Valley fever in tourists. The majority of farms affected2 by the outbreak are outside areas generally visited by travelers.

Most of the cases have been found in farm workers in two provinces: Free State and Northern Cape3.

Most human infections with Rift Valley fever are caused by direct or indirect contact with diseased animals. Infected mosquitoes can also pass the disease to humans. So can drinking unpasteurized or uncooked milk from infected animals.

Most human cases of the disease are minor4. Some patients do not get sick at all. Others may get flu-like symptoms such as fever, muscle and joint5 pain and headaches. Patients normally recover within seven days.

In January 2007, in a village in Kenya, a Kenyan public health officer demonstrates how to spray a mixture of insecticides and water to prevent mosquitoes from entering houses during an outbreak of Rift Valley Fever

But patients with more severe forms can go blind. Some develop encephalitis, a brain disease that can lead to headaches, coma6 or seizures7. And some patients bleed to death.

The World Health Organization says Rift Valley fever was first discovered in Kenya in nineteen thirty-one. In the year two thousand, it was identified in Saudi Arabia and Yemen. These were the first reported cases of Rift Valley fever outside of Africa.

Current vaccines9 to protect against Rift Valley fever are limited to use in animals. But researchers are working to develop the first human vaccine8.

In a new study, scientists in the United States tested vaccines made with two kinds of inactivated10 virus. They said tests in mice showed that their new vaccines are safer than live-virus vaccines and appear to work just as well. Using live virus in vaccines can increase the risks.

The researchers are at the University of Pittsburgh and the University of North Carolina. Their study appeared in the journal PLoS Neglected Tropical Diseases, published by the Public Library of Science,.

And that's the VOA Special English Development Report, written by June Simms. You can read and listen to all of our reports at voaspecialenglish.com. You can also find us on Facebook, Twitter, YouTube and iTunes at VOA Learning English. I'm Steve Ember
 


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1 rift bCEzt     
n.裂口，隙缝，切口；v.裂开，割开，渗入
参考例句：
  • He was anxious to mend the rift between the two men.他急于弥合这两个人之间的裂痕。
  • The sun appeared through a rift in the clouds.太阳从云层间隙中冒出来。
2 affected TzUzg0     
adj.不自然的，假装的
参考例句：
  • She showed an affected interest in our subject.她假装对我们的课题感到兴趣。
  • His manners are affected.他的态度不自然。
3 cape ITEy6     
n.海角，岬；披肩，短披风
参考例句：
  • I long for a trip to the Cape of Good Hope.我渴望到好望角去旅行。
  • She was wearing a cape over her dress.她在外套上披着一件披肩。
4 minor e7fzR     
adj.较小(少)的，较次要的；n.辅修学科；vi.辅修
参考例句：
  • The young actor was given a minor part in the new play.年轻的男演员在这出新戏里被分派担任一个小角色。
  • I gave him a minor share of my wealth.我把小部分财产给了他。
5 joint m3lx4     
adj.联合的，共同的；n.关节，接合处；v.连接，贴合
参考例句：
  • I had a bad fall,which put my shoulder out of joint.我重重地摔了一跤，肩膀脫臼了。
  • We wrote a letter in joint names.我们联名写了封信。
6 coma vqxzR     
n.昏迷，昏迷状态
参考例句：
  • The patient rallied from the coma.病人从昏迷中苏醒过来。
  • She went into a coma after swallowing a whole bottle of sleeping pills.她吃了一整瓶安眠药后就昏迷过去了。
7 seizures d68658a6ccfd246a0e750fdc12689d94     
n.起获( seizure的名词复数 )；没收；充公；起获的赃物
参考例句：
  • Seizures of illicit drugs have increased by 30% this year. 今年违禁药品的扣押增长了30%。 来自《简明英汉词典》
  • Other causes of unconsciousness predisposing to aspiration lung abscess are convulsive seizures. 造成吸入性肺脓肿昏迷的其他原因，有惊厥发作。 来自辞典例句
8 vaccine Ki1wv     
n.牛痘苗，疫苗；adj.牛痘的，疫苗的
参考例句：
  • The polio vaccine has saved millions of lives.脊髓灰质炎疫苗挽救了数以百万计的生命。
  • She takes a vaccine against influenza every fall.她每年秋季接种流感疫苗。
9 vaccines c9bb57973a82c1e95c7cd0f4988a1ded     
疫苗，痘苗( vaccine的名词复数 )
参考例句：
  • His team are at the forefront of scientific research into vaccines. 他的小组处于疫苗科研的最前沿。
  • The vaccines were kept cool in refrigerators. 疫苗放在冰箱中冷藏。
10 inactivated 9301af139e2f8eb6dae70f855b1f1216     
v.使不活泼，阻止活动( inactivate的过去式和过去分词 )
参考例句：
  • Molluscicides are quickly inactivated by sunlight and adsorption to mud organic matter. 灭螺剂因阳光作用、泥土及有机物质的吸收会很快失效。 来自辞典例句
  • Viruses were inactivated by BPL and the toxicity measured again. BPL对病毒进行灭活，测定残存毒力。 来自互联网

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