VOA慢速英语 2007 1205a

This is the VOA Special English Health Report.

There are low-cost vaccines², taken by mouth, that can protect against cholera³. The vaccine¹ is commonly provided to international travelers, but not to communities that suffer cholera epidemics⁵. There are questions about how effective it would be as a control measure.

New findings suggest that it would be highly effective. These are based on the predictions of a computer model. Researchers say the model shows that the vaccine could reduce new cases in high-risk areas by ninety percent. And they say only half the population would have to take it once every two years.

 
Angolan children gathering⁶ water at a waste-filled stream.  A cholera epidemic⁴ in Angola killed over one thousand people last year. 
Cholera is a serious bacterial⁷ disease found mainly in developing countries. People can get it from water or food that comes in contact with human waste. The intestinal⁸ infection causes a loss of fluids.

Cholera is treated by drinking an oral rehydration solution which replaces lost fluids and salts. In the most severe cases, fluids are injected into the body. Without treatment, it usually kills people within eighteen hours to several days. Estimates are that the disease kills at least one hundred thousand people a year. 

Ira Longini at the Fred Hutchinson Cancer Research Center in Seattle, Washington, led the new work. A team from the United States, South Korea and Bangladesh based it on a large study of oral cholera vaccine.

The study took place between nineteen eighty-four and nineteen eighty-nine. It involved two hundred thousand women and children in rural Bangladesh.

The team developed the computer model based on the results of the study. The model showed that if fifty percent of a high-risk community is vaccinated⁹, many unvaccinated people also would be protected.

The researchers say the number of new infections could drop below one in one thousand people in the unvaccinated population. This would be the result of what is known as "herd¹⁰ protection."

The idea is that vaccinated people would not become infected, so they would not create conditions for spreading the disease. Unvaccinated people then would have a better chance of avoiding it.

Ira Longini says researchers are very good at predicting where cholera is likely to spread. So vaccination¹¹ efforts could target those areas.  The findings appear in the medical journal published by the Public Library of Science and available free of charge at plos.org.

And that's the VOA Special English Health Report, written by Caty Weaver¹². For more health news, along with transcripts¹³ and MP3 files of our reports, go to voaspecialenglish.com. I'm Steve Ember.

 

1 vaccine   

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。

2 vaccines   

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。

3 cholera   

n.霍乱

参考例句：

• The cholera outbreak has been contained.霍乱的发生已被控制住了。
• Cholera spread like wildfire through the camps.霍乱在营地里迅速传播。

4 epidemic   

n.流行病；盛行；adj.流行性的，流传极广的

参考例句：

• That kind of epidemic disease has long been stamped out.那种传染病早已绝迹。
• The authorities tried to localise the epidemic.当局试图把流行病限制在局部范围。

5 epidemics   

n．流行病

参考例句：

• Reliance upon natural epidemics may be both time-consuming and misleading. 依靠天然的流行既浪费时间，又会引入歧途。
• The antibiotic epidemics usually start stop when the summer rainy season begins. 传染病通常会在夏天的雨季停止传播。

6 gathering   

n.集会，聚会，聚集

参考例句：

• He called on Mr. White to speak at the gathering.他请怀特先生在集会上讲话。
• He is on the wing gathering material for his novels.他正忙于为他的小说收集资料。

7 bacterial   

a.细菌的

参考例句：

• Bacterial reproduction is accelerated in weightless space. 在失重的空间，细菌繁殖加快了。
• Brain lesions can be caused by bacterial infections. 大脑损伤可能由细菌感染引起。

8 intestinal   

adj.肠的；肠壁；肠道细菌

参考例句：

• A few other conditions are in high intestinal obstruction. 其它少数情况是高位肠梗阻。 来自辞典例句
• This complication has occasionally occurred following the use of intestinal antiseptics. 这种并发症偶而发生在使用肠道抗菌剂上。 来自辞典例句

9 vaccinated   

[医]已接种的，种痘的，接种过疫菌的

参考例句：

• I was vaccinated against tetanus. 我接种了破伤风疫苗。
• Were you vaccinated against smallpox as a child? 你小时候打过天花疫苗吗？

10 herd   

n.兽群，牧群；vt.使集中，把…赶在一起

参考例句：

• She drove the herd of cattle through the wilderness.她赶着牛群穿过荒野。
• He had no opinions of his own but simply follow the herd.他从无主见，只是人云亦云。

11 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。

12 weaver   

n.织布工；编织者

参考例句：

• She was a fast weaver and the cloth was very good.她织布织得很快，而且布的质量很好。
• The eager weaver did not notice my confusion.热心的纺织工人没有注意到我的狼狈相。

13 transcripts   

n.抄本（ transcript的名词复数 ）；转写本；文字本；副本

参考例句：

• Like mRNA, both tRNA and rRNA are transcripts of chromosomal DNA. tRNA及rRNA同mRNA一样，都是染色体DNA的转录产物。 来自辞典例句
• You can't take the transfer students'exam without your transcripts. 没有成绩证明书，你就不能参加转学考试。 来自辞典例句