官方APP下载:英语学习播客(支持苹果手机、安卓手机)
创办于2003年
UNSV记不住?那就记中文谐音“忧安思危”吧!
  Slow and Steady Wins the Race!
UNSV英语学习频道 - Slow and steady wins the race!
公众微信服务号(英语全能特训)
英语全能特训(微信公众服务号)
UNSV英语学习频道淘宝网店
客服短信:18913948480
客服邮箱:web@unsv.com
初级VIP会员
全站英语学习资料下载。
¥98元/12个月

HEALTH REPORT - New Test Could Speed Tuberculosis Results

作者:Caty Weaver 发布日期:3-25-2009

This is the VOA Special English Health Report.

Tuberculosis killed one million three hundred thousand people around the world in two thousand seven. In addition, almost half a million people who were infected with tuberculosis and with H.I.V. also died. Those were listed as H.I.V. deaths.

An estimated one-third of all people are infected with tuberculosis. But the body's natural defenses are usually strong enough to prevent an active case. Even so, the bacteria remain in the body. If the immune system weakens at any point, they begin to spread and then attack.

A doctor at a clinic in South Africa looks at a patient's X-ray as part of a TB exam
A doctor at a clinic in South Africa looks at a patient's X-ray as part of a TB exam

The bacteria that cause TB usually settle in the lungs. They spread through the air when the person coughs or sneezes or even sings and talks.

One of the most important things is to identify cases quickly -- especially drug-resistant cases, which are increasing. The patients need to be kept away from other people and begin treatment as soon as possible.

Multidrug resistant tuberculosis, or MDR-TB, will not get better with antibiotics normally used for tuberculosis. So doctors must use stronger, "second line" drugs when the first ones fail. Extensively drug-resistant tuberculosis, or XDR-TB, will not respond to any of those drugs but might still be treatable.

Now, researchers say they have found a much faster way to identify drug-resistant TB. The study's lead author is Graham Hatfull at the University of Pittsburgh in Pennsylvania. He says current tests can sometimes take weeks in rural and poor areas of the world. By that time, the patient may already be dead.

The scientists used viruses called bacteriophages to speed the process. These viruses attack bacteria. The researchers injected them with a gene that produces a green glow of light. They also injected some with first line antibiotics and others with second line drugs.

Then they combined the bacteriophages with TB bacteria. If the bacteria glow, it means they are drug resistant. The researchers say a clinic worker could identify the glow with equipment available in many clinics. Test results would not have to wait for the bacteria to grow in a laboratory far away.

For now, the test itself needs more testing. But Professor Hatfull is hopeful this will take months and not years.

Researchers from the Albert Einstein College of Medicine in New York also took part in the study, financed by the Howard Hughes Medical Institute. The findings appear in the journal PLoS ONE, published by the Public Library of Science.

And that's the VOA Special English Health Report, written by Caty Weaver. I'm Steve Ember.

版权所有©2003-2019 南京通享科技有限公司,保留所有权利。未经书面许可,严禁转载本站内容,违者追究法律责任。 互联网经营ICP证:苏B2-20120186
网站备案:苏公网安备 32010202011039号苏ICP备05000269号-1中国工业和信息化部网站备案查询
广播台