March 20, 2025
    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: 欧美一线不卡在线播放| 草莓视频未满十八岁| 夜夜爱夜夜做夜夜爽| 中文字幕在线网站| 日韩中文字幕在线播放| 亚洲人成色7777在线观看不卡| 91精品国产高清久久久久| 五月婷婷伊人网| 欧洲美熟女乱又伦免费视频| 国产一级毛片大陆| 色综合色综合久久综合频道| 国内黄色一级片| qvod激情小说| 最近更新中文字幕在线| 亚洲狠狠婷婷综合久久蜜芽| 痴汉电车中文字幕| 四虎AV永久在线精品免费观看| 398av影院视频在线| 无码不卡中文字幕av| 久草香蕉视频在线观看| 用手指搅乱吧~打烊后的...| 国产00粉嫩馒头一线天萌白酱| 1000部夫妻午夜免费| 成人理论电影在线观看| 亚洲国产精品综合久久网络| 玉蒲团之天下第一| 全彩成人18h漫画在线| 韩国一区二区视频| 国产精品网站在线观看免费传媒 | 国产又色又爽又刺激在线播放| 99久久中文字幕伊人| 好看的中文字幕在线| 久久精品免费观看国产| 特级欧美老少乱配| 办公室开档情趣内衣做爽视频| 翁止熄痒禁伦短文合集免费视频| 国产丰满乱子伦无码专区| 青娱乐在线视频免费观看| 国产天堂亚洲国产碰碰| 黑人3p波多野结衣在线观看| 在线精品91青草国产在线观看 |