久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

   
 

Basics about bird flu

By chinadaily.com.cn (null)
Updated: 2004-01-29 14:46

The rapid spread of bird flu, which is not uncommon among chickens and other fowl, has caught the attention of global health authorities. Here are the ABCs about this disease.

What is bird flu?

There are at least 15 different types of avian influenza that routinely infect birds around the world. The current outbreak is caused by a strain known as H5N1, which is highly contagious among birds and rapidly fatal. Unlike many other strains of avian influenza, it can be transmitted to humans, causing severe illness and death.

Bird flu is not the same as SARS (severe acute respiratory syndrome). Although their symptoms are similar, SARS is caused by completely different viruses. Influenza viruses also are more contagious and cannot be as readily contained as SARS by isolating people who have the infection.

Why the concern?

Influenza viruses are highly unstable and have the ability to mutate rapidly, potentially jumping from one animal species to another. Scientists fear the bird flu virus could evolve into a form that is easily spread between people, resulting in an extremely contagious and lethal disease. This could happen if someone already infected with the human flu virus catches the bird flu. The two viruses could recombine inside the victim's body, producing a hybrid that could readily spread from person to person.

The resulting virus likely would be something humans have never been exposed to before. With no immune defenses, the infection could cause devastating illness, such as occurred in the 1918-19 Spanish flu pandemic, which killed an estimated 40 million to 50 million worldwide.

How is bird flu virus transmitted?

In rural areas, the H5N1 virus is easily spread from farm to farm among domestic poultry through the feces of wild birds. The virus can survive for up to four days at 71 F (22 C) and more than 30 days at 32 F (0 C). If frozen, it can survive indefinitely.

So far in this outbreak, human cases have been blamed on direct contact with infected chickens and their droppings. People who catch the virus from birds can pass it on to other humans, although the disease is generally milder in those who caught it from an infected person rather than from birds.

If the virus mutates and combines with a human influenza virus, it could be spread through person-to-person transmission in the same way the ordinary human flu virus is spread.

What are the symptoms of bird flu?

Bird flu can cause a range of symptoms in humans. Some patients report fever, cough, sore throat and muscle aches. Others suffer from eye infections, pneumonia, acute respiratory distress and other severe and life-threatening complications.

How could bird flu be treated?

Flu drugs exist that may be used both to prevent people from catching bird flu and to treat those who have it. The virus appears to be resistant to two older generic flu drugs, amantadine and rimantadine. However, the newer flu drugs Tamiflu and Relenza are expected to work - though supplies could run out quickly if an outbreak occurs.

Currently there is no vaccine, although scientists are working to develop one. It probably will take several months to complete and may not be ready in time to stop a widespread human outbreak, if one occurs.

Culling an effective prevention measure

Rapid elimination of the H5N1 virus among infected birds and other animals is essential to preventing a major outbreak. The World Health Organization recommends that infected or exposed flocks of chickens and other birds be killed in order to help prevent further spread of the virus and reduce opportunities for human infection. However, the agency warns that safety measures must be taken to prevent exposure to the virus among workers involved in culling. (Sources: AP, CDC and WHO)



Top China News  
Today's Top News  
Most Commented/Read Stories in 48 Hours
久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

    欧美伊人久久久久久久久影院| 欧美丰满少妇xxxbbb| 亚洲欧美综合网| 91视视频在线直接观看在线看网页在线看 | 国产精品天美传媒沈樵| 91小视频在线观看| 夜夜嗨av一区二区三区中文字幕 | 国产亚洲短视频| 91亚洲国产成人精品一区二区三| 亚洲自拍偷拍九九九| 欧美一级二级三级蜜桃| 国产成人精品一区二区三区网站观看| 中文字幕的久久| 欧美性受极品xxxx喷水| 久久99精品久久久久婷婷| 中文天堂在线一区| 欧美日韩免费观看一区二区三区| 美女视频黄 久久| 《视频一区视频二区| 91精品久久久久久久久99蜜臂| 激情成人综合网| 亚洲日本免费电影| 欧美电影免费观看完整版| av在线不卡网| 美国毛片一区二区三区| 综合亚洲深深色噜噜狠狠网站| 欧美老肥妇做.爰bbww| 国产 日韩 欧美大片| 亚洲国产wwwccc36天堂| 久久在线免费观看| 欧日韩精品视频| 国产一区欧美日韩| 一区二区三区不卡在线观看| 欧美va亚洲va香蕉在线| 91麻豆.com| 狠狠狠色丁香婷婷综合激情| 亚洲欧美另类小说| 欧美精品一区二区三区视频| 欧美在线视频日韩| 国产成人精品免费| 蜜臀久久久99精品久久久久久| 国产精品大尺度| 日韩精品一区二区三区视频播放| 99re6这里只有精品视频在线观看| 奇米色一区二区三区四区| 亚洲欧美视频在线观看| 久久精品一区二区三区av| 欧美日韩国产bt| 99精品久久只有精品| 国产一区二区伦理| 图片区日韩欧美亚洲| 中文字幕一区二区三区av| 精品区一区二区| 欧美日本在线一区| 99久久亚洲一区二区三区青草| 久久国产精品一区二区| 一区二区高清免费观看影视大全| 日本一区二区三区视频视频| 4438亚洲最大| 欧美无乱码久久久免费午夜一区| 成人午夜视频在线| 激情五月激情综合网| 日本91福利区| 亚洲综合色视频| 亚洲欧美一区二区三区极速播放| 国产色91在线| 欧美不卡在线视频| 欧美一区二区在线免费观看| 欧美丝袜丝交足nylons| 99久久久免费精品国产一区二区| 国产在线视频一区二区三区| 蜜桃av一区二区三区| 天天色图综合网| 一区二区免费在线播放| 中文字幕一区二区三| 日本一区二区综合亚洲| 久久久一区二区三区捆绑**| 日韩一区二区三区免费观看| 欧美日韩亚洲不卡| 在线精品视频免费观看| 91美女视频网站| 91污片在线观看| 成人av综合在线| 丁香激情综合五月| 国产在线播精品第三| 久久er精品视频| 久久精品国产精品亚洲综合| 男女激情视频一区| 日韩国产精品91| 日韩高清一区在线| 免费人成在线不卡| 麻豆精品久久久| 毛片av一区二区| 久久精品国产久精国产爱| 美国av一区二区| 久草在线在线精品观看| 精品在线一区二区三区| 久久99精品久久久久久动态图| 蜜臀av一区二区在线免费观看| 蜜臀久久99精品久久久久久9| 美脚の诱脚舐め脚责91 | 色综合久久天天综合网| 99视频在线精品| 99国产精品99久久久久久| 一本色道久久加勒比精品| 91网站黄www| 91精品福利视频| 欧美日韩一区二区三区在线看| 欧美性三三影院| 欧美日韩国产区一| 欧美一区二区视频观看视频| 欧美一级艳片视频免费观看| 日韩免费视频一区| 精品电影一区二区三区| 国产亚洲一区二区三区四区| 中文字幕巨乱亚洲| 亚洲色图在线视频| 午夜精品免费在线观看| 蜜桃一区二区三区四区| 国产精品911| eeuss鲁片一区二区三区在线看| 97精品电影院| 91国产免费看| 7777精品伊人久久久大香线蕉| 欧美一卡在线观看| 国产午夜精品理论片a级大结局| 中文字幕欧美激情| 一区二区在线免费| 日本中文字幕一区二区视频| 激情国产一区二区| 99精品桃花视频在线观看| 欧美三级视频在线观看 | 日韩精品中文字幕一区| 久久精品夜色噜噜亚洲aⅴ| 亚洲欧美在线视频| 五月天视频一区| 国产一区二区三区久久悠悠色av| 成人aaaa免费全部观看| 欧美日韩综合在线| 精品国产乱码久久久久久老虎| 国产精品久久久久国产精品日日| 亚洲一区二区美女| 国内成+人亚洲+欧美+综合在线 | 欧美日韩一级片网站| 日韩欧美激情四射| 一区二区中文视频| 日韩国产欧美三级| 成人免费视频caoporn| 欧美三级在线看| 国产香蕉久久精品综合网| 亚洲精品ww久久久久久p站| 热久久一区二区| av中文字幕在线不卡| 51精品秘密在线观看| 亚洲国产精品高清| 五月综合激情网| 国产jizzjizz一区二区| 欧美日韩一区不卡| 欧美国产欧美亚州国产日韩mv天天看完整| 一区二区三区四区视频精品免费| 九九九久久久精品| 日本乱人伦aⅴ精品| 精品国产三级电影在线观看| 一区二区三区四区五区视频在线观看| 久久国产精品99精品国产| 99re热视频这里只精品| 精品盗摄一区二区三区| 亚洲最大色网站| 国产经典欧美精品| 欧美日本在线观看| 国产精品全国免费观看高清 | 日韩国产欧美在线观看| 不卡影院免费观看| 日韩欧美专区在线| 曰韩精品一区二区| 国产一区不卡在线| 欧美男男青年gay1069videost | 蜜桃视频免费观看一区| 一本大道久久a久久精品综合| 精品88久久久久88久久久| 亚洲一区二区三区四区在线| 成人一级视频在线观看| 日韩免费电影网站| 午夜久久电影网| 一本在线高清不卡dvd| 久久久不卡网国产精品二区 | 日本美女一区二区三区视频| 99久久精品免费精品国产| 精品国产一区二区三区av性色 | 91精品国产91久久久久久一区二区| 国产精品灌醉下药二区| 黑人巨大精品欧美黑白配亚洲| 欧美日韩激情一区| 亚洲视频1区2区| 成人午夜精品一区二区三区| 日韩精品专区在线影院重磅| 亚洲va欧美va国产va天堂影院| 99久久精品久久久久久清纯| 久久久美女毛片| 精品一区二区三区在线视频|