Advanced Search  
   
 
China Daily  
Top News   
Nation   
Business   
Opinion   
Feature   
Sports   
World   
Special   
HK Edition   
Business Weekly   
Beijing Weekend   
Supplement   
Shanghai Star  
21Century  
Manufacturers, Exporters, Wholesalers - Global trade starts here.
 
Nation ... ...
Advertisement
    Chinese scientists develop bird flu vaccines

2005-05-27 05:30

HARBIN: Chinese scientists announced on Wednesday that they have developed two new vaccines capable of stopping the spread of the deadly H5N1 strain of bird flu to birds, mammals and humans.

They also said they are willing to provide details of epidemic prevention to other countries and regions, and contribute to agriculture and public health security worldwide.

Chen Hualan, director of the China National Bird Flu Reference Laboratory, based in Harbin, capital of Heilongjiang Province, said the two new vaccines developed by her lab had proved to be a success.

She said they had passed a State-level appraisal, and had obtained a permit granted by the Ministry of Agriculture for sale on the market.

"Experiments show the efficiency rate of the newly developed vaccines in preventing infection by the H5N1 virus is 100 per cent," claimed Chen.

In the meantime, China has developed three new technologies which in less than 10 hours can confirm a bird flu epidemic.

In the past, it took 72 hours to get confirmation.

Dr Bernard Vallat, director-general of the World Organization for Animal Health, said China leads the world in research on bird flu and relevant technologies for its prevention.

Samples of the two new vaccines have been sent to Gangcha County, Qinghai Province, where dead migratory birds - confirmed by Chen's lab to have died after catching the deadly H5N1 virus - were found on May 4. The vaccines will help prevent the deadly avian disease from spreading.

The Ministry of Agriculture also made an announcement about the incident last Saturday. It is the first reported bird flu case on the Chinese mainland since last year.

Sources said some of the dead migratory birds discovered in Gangcha County migrated from Southeast Asia. Migration is blamed for spreading the bird flu virus, and China is a main stopping-off point for migratory birds in Asia.

There is a high risk of waterfowl becoming infected with the deadly bird flu virus after mingling with migratory birds already carrying the killer disease. The bird flu virus can easily spread to domestic fowl and even humans via birds infected with the H5N1 virus.

There have been no other reports of vaccines being tested on water birds before China began its research. The latest experimental results show that the newly developed vaccines are equally effective in fowl such as ducks and geese, which when inoculated with the vaccines did not develop bird flu symptoms.

"With these vaccines, one 'activated' and the other 'inactivated,' a major way for the spread of the bird flu virus can be eradicated," said Chen.

Compared with conventional vaccines, the inactivated bird flu vaccine can provide stronger protection against infection in water birds such as ducks and geese upon inoculation. The bird flu activated vaccine can produce a protective shield against the H5N1 virus in fowls within nine months after inoculation.

"Both the activated and inactivated vaccines will not affect food security," said Chen.

An estimate made in February last year by the United Nations Food and Agriculture Organization found that about 100 million domestic fowl died of the H5N1 virus or were culled because they were infected between late 2003 and 2004. Direct economic losses were placed at US$500 million.

At least 52 people have died in Viet Nam, Thailand and Cambodia after being diagnosed as having bird flu.

The World Health Organization has warned that over 1 million more people could die if the H5N1 virus spreads among people.

The number of human deaths caused by common flu each year is between 250,000 and 500,000, but scientists believe mortality caused by bird flu could be much higher.

According to Chen, some chicken farms in Viet Nam have been conducting experiments with the new vaccines developed by Chen's lab to check their safety and effectiveness.

Agricultural officials in Viet Nam said they would inoculate all their domestic fowl with the new bird flu vaccines once the experiments prove positive.

"We will spare no efforts in offering support to other countries if necessary," the Chinese scientist promised.

(China Daily 05/27/2005 page3)

                 

| Home | News | Business | Culture | Living in China | Forum | E-Papers |Weather |

|About Us | Contact Us | Site Map | Jobs | About China Daily |
 Copyright 2005 Chinadaily.com.cn All rights reserved. Registered Number: 20100000002731
主站蜘蛛池模板: 国产乱码精品一区三上| 娇妻校花欲乱往事叶子| 亚洲jjzzjjzz在线观看| 波多野结衣家庭教师奇优| 强制邻居侵犯456在线观看| 久久精品中文騷妇女内射| 精品国产AV色欲果冻传媒| 国产免费av片在线无码免费看| 亚洲资源最新版在线观看| 性做久久久久久免费观看| 久久国产精品久久久| 波多野结衣第一页| 再来一次好吗动漫免费观看| 色综久久天天综合绕视看| 国产性生交xxxxx免费| fulidown国产精品合集| 欧洲a老妇女黄大片| 亚洲欧美国产va在线播放| 狂野欧美性猛交xxxx| 国产亚洲美女精品久久久久| 日产精品一二三四区国产| 国产精品爽黄69天堂a| 97高清国语自产拍中国大陆| 日本a级视频在线播放| 久久综合九色综合欧洲| 果冻传媒app下载网站| 亚洲国产欧美在线观看| 欧美激情视频二区| 亚洲特级aaaaaa毛片| 美女bbbb精品视频| 国产一国产二国产三国产四国产五| 高h黄全肉一女n男古风| 国产强被迫伦姧在线观看无码 | 欧美交换乱理伦片在线观看| 午夜性色吃奶添下面69影院| 日本理论片www视频| 国产精品无码素人福利不卡| 91啦中文成人| 国产精品高清一区二区三区不卡| 97久久香蕉国产线看观看| 国内精品久久久久久|