VOA慢速英语2010年-Development Report - New Vaccine Joins
时间：2019-01-31 作者：英语课 分类：2010年慢速英语(一)月
This is the VOA Special English Development Report.
An Afghan girl receives a dose of polio vaccine 1
The World Health Organization has begun to use a new vaccine against polio. Officials say it will become a major tool in the campaign to end a disease that mainly affects children under age five.
The new formulation is known as B.O.P.V. , or bivalent oral polio vaccine. It was used for the first time in December in a polio immunization campaign in Afghanistan.
Carol Pandak is with the PolioPlus program of the service organization Rotary 2 International. She explains that health workers have been using what are called trivalent vaccines 3 in some places. These are areas like Afghanistan where more than one kind of polio virus exists.
There are three types of polio virus. The trivalent vaccine is least effective against type three, more effective against type one and highly effective against type two. As a result, few new cases of type two have been reported since nineteen ninety-nine.
This has led to greater use of monovalent vaccines to protect against either type one or type three polio. But Carol Pandak says the monovalent vaccine is not enough in areas with both.
CAROL PANDAK: "You address the type one, and the type three cases go up. You address the type three, and the type one cases go up."
Rod Curtis at the World Health Organization in Geneva says the new bivalent vaccine solves this problem.
ROD CURTIS: "The beauty of the bivalent vaccine is that it is able to attack both types of wild polio virus in one dose."
Carol Pandak says tests found the new vaccine to be thirty percent more effective than the trivalent vaccine.
More than thirty new cases of polio were reported in Afghanistan last year. About half were type one and the others type three. Rod Curtis says that shows the importance of the new vaccine targeting both viruses at once. Officials say similar vaccination 4 campaigns are planned this year in India, Nigeria and Pakistan.
Intensive vaccination campaigns have reduced the number of new polio cases reported worldwide to fewer than two thousand a year. The Global Polio Eradication 5 Initiative says the number has fallen by ninety-nine percent since nineteen eighty eight.
Polio is highly infectious. One victim in two hundred suffers permanent paralysis 6, usually in the legs. Five to ten percent of those victims die when their breathing muscles fail.
And that's the VOA Special English Development Report, written by June Simms. I'm Steve Ember.
- 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。
- The central unit is a rotary drum.核心设备是一个旋转的滚筒。
- A rotary table helps to optimize the beam incidence angle.一张旋转的桌子有助于将光线影响之方式角最佳化。
- 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。
- 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。
- The eradication of an established infestation is not easy. 根除昆虫蔓延是不容易的。
- This is often required for intelligent control and eradication. 这经常需要灵巧的控制与消除。