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

您現在的位置: Language Tips> Audio & Video> Special Speed News  
 





 
Fighting Exotic Newcastle disease
[ 2007-12-18 10:13 ]

 

Download

This is the VOA Special English Agriculture Report.

Newcastle disease is a bird virus found in many parts of the world. Many kinds of birds carry it. But it especially affects chickens and a few others.

It spreads very fast and there is no treatment. Many birds die without appearing sick. The infection does not present a serious health threat to humans. But economic losses can be huge as birds are destroyed and trade is restricted to contain outbreaks.

Exotic Newcastle disease, also known as END, is the most severe form of Newcastle disease.

Experts say the easiest way to prevent the virus is to import birds from flocks that are disease-free. Vaccines are also used, although experts say the virus may sometimes cause deaths even in vaccinated flocks.

In the United States, the Agriculture Department says poultry birds are rarely vaccinated against the virus unless an outbreak happens. The most recent outbreak began in 2002 in California. State officials said it cost more than one hundred sixty million dollars to fight. California was declared disease-free the next year, after the killing of more than three million birds.

The Global Invasive Species Database says signs of the disease may appear from two to fifteen days after a bird is infected. An infected hen lays fewer or no eggs, or eggs with thin shells. A sick bird may develop breathing and intestinal problems and twist its head and neck. It may run around in circles or not move at all.

Exotic Newcastle disease spreads fastest among birds kept close together. The virus is spread through bird droppings and fluid from the nose, mouth and eyes.

To control outbreaks, experts advise quick destruction of infected flocks. They also advise limiting entry to farms and disinfecting vehicles as they come and go.

People can also transport the virus on their shoes and clothes. The virus can survive several weeks in a warm, moist environment. And there seems to be no limit if it is frozen. But ultraviolet rays in sunlight can kill it.

To reduce infection risks, the Organization for World Animal Health warns against keeping any pet birds on a farm. It even advises against hiring pet bird owners as farm workers. The Agriculture Department says Amazon parrots, for example, can spread the virus for more than a year but not get sick.

And that's the VOA Special English Agriculture Report, written by Jerilyn Watson. I'm Steve Ember.

(Source: VOA 英語點津姍姍編輯)

 
 
相關文章 Related Stories
 

 

 

 
 

本頻道最新推薦

     
  Fighting Exotic Newcastle disease
  Medvedev nominated as Putin's successor
  Bush: Iran has no need to enrich uranium
  Bike Beijing, Green Olympics
  Interview with Mrs Leavitt

論壇熱貼

     
  開個題目大家扯:hotel & restaurant
  追求某人
  請教工商年檢如何翻譯
  How to translate “中國老字號”into English?
  "港股直通車"怎么翻譯?
  兩免一補怎么說?




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

    国产精品狼人久久影院观看方式| 国产麻豆午夜三级精品| 九九热在线视频观看这里只有精品| 欧美精品777| 亚洲高清免费视频| 宅男噜噜噜66一区二区66| 裸体健美xxxx欧美裸体表演| 久久理论电影网| 国产一区二区三区视频在线播放| 久久网站最新地址| 精品一区二区国语对白| 国产精品国产自产拍高清av | 日本午夜精品一区二区三区电影 | 成人激情免费视频| 樱桃视频在线观看一区| 5月丁香婷婷综合| 国产精品77777竹菊影视小说| 国产精品久久久久久久久搜平片| 在线观看三级视频欧美| 日本伊人色综合网| 国产精品天干天干在线综合| 欧美午夜精品一区| 国产在线播放一区| 尤物视频一区二区| 精品国产乱码久久久久久1区2区 | 久久久久久久久久久电影| 99国产精品一区| 秋霞影院一区二区| 中文字幕一区二区三| 91精品国产一区二区三区| 8v天堂国产在线一区二区| 国产盗摄女厕一区二区三区| 亚洲国产精品久久久男人的天堂 | 国产成人综合在线| 亚洲国产欧美日韩另类综合| 久久精品视频免费| 欧美无乱码久久久免费午夜一区 | 精品国产区一区| 日本大香伊一区二区三区| 国产自产视频一区二区三区| 一区二区日韩电影| 国产无一区二区| 欧美精品一级二级| www.爱久久.com| 精品一区二区免费视频| 亚洲成av人片在线| 国产精品久久久一本精品| 日韩你懂的在线播放| 色欧美片视频在线观看在线视频| 国产麻豆成人精品| 丝袜美腿亚洲色图| 亚洲欧洲综合另类在线| 久久婷婷一区二区三区| 欧美日高清视频| 波多野结衣中文字幕一区| 久久精品国产77777蜜臀| 亚洲一线二线三线久久久| 欧美激情资源网| 精品国产伦一区二区三区观看体验| 欧美视频自拍偷拍| 91在线云播放| 丰满亚洲少妇av| 久久国产婷婷国产香蕉| 午夜精品一区二区三区电影天堂| 中文字幕一区二区三区在线观看| 久久综合狠狠综合久久激情| 欧美精品九九99久久| 一本一道综合狠狠老| 国产精品77777| 久久97超碰色| 日本麻豆一区二区三区视频| 亚洲国产日韩a在线播放| 中文字幕欧美三区| 久久久精品国产免费观看同学| 欧美日韩综合在线| 色婷婷一区二区| 99久久精品国产精品久久| 国产精品99久久久久久有的能看| 老司机精品视频在线| 五月天亚洲婷婷| 亚洲一线二线三线久久久| 亚洲欧美偷拍卡通变态| 国产精品丝袜久久久久久app| 26uuu精品一区二区在线观看| 欧美日韩1234| 欧美精品久久天天躁| 欧美亚洲国产怡红院影院| 日本韩国欧美在线| 色婷婷精品大在线视频| 91免费看视频| 色婷婷亚洲综合| 色94色欧美sute亚洲线路一久| 97成人超碰视| 色天天综合色天天久久| 色综合久久88色综合天天免费| 91麻豆产精品久久久久久 | 成人av资源在线观看| 成人动漫精品一区二区| 成人av影视在线观看| 成人a级免费电影| av电影天堂一区二区在线| 91亚洲精华国产精华精华液| 91在线无精精品入口| 日本精品免费观看高清观看| 在线免费观看日本一区| 欧美自拍偷拍午夜视频| 欧美日韩国产系列| 欧美一级二级三级蜜桃| 欧美不卡在线视频| 久久久综合网站| 国产欧美日韩一区二区三区在线观看 | 久久久九九九九| 国产精品一二三四区| 九色综合狠狠综合久久| 国产麻豆精品theporn| 久久国产精品色| 国产成人亚洲综合a∨婷婷| 成人高清免费在线播放| 91香蕉视频mp4| 在线观看av一区| 欧美福利电影网| 欧美不卡在线视频| 国产精品视频一区二区三区不卡| 亚洲天堂免费看| 亚洲风情在线资源站| 日韩中文字幕亚洲一区二区va在线| 日韩av中文字幕一区二区三区| 黑人巨大精品欧美黑白配亚洲| 国产精品资源在线观看| 成人91在线观看| 欧美亚州韩日在线看免费版国语版| 欧美一区二区三级| 日本一区二区三区电影| 亚洲女与黑人做爰| 日韩国产在线一| 精品一区二区三区免费播放| 成人av影院在线| 欧美日韩日日骚| 久久婷婷国产综合精品青草| 国产精品福利av | 亚洲天堂成人网| 丝袜亚洲另类欧美| 国产电影精品久久禁18| 一本一道波多野结衣一区二区| 欧美一区二区在线观看| 中文一区在线播放| 亚洲国产精品自拍| 国产在线精品一区二区夜色| youjizz久久| 欧美三级在线视频| 久久精品夜色噜噜亚洲a∨| 亚洲免费看黄网站| 美女任你摸久久| 91年精品国产| 欧美精品一区二区三区久久久| 亚洲图片欧美激情| 日本成人在线网站| 成人激情黄色小说| 91精品国产免费久久综合| 国产精品女人毛片| 日韩av中文字幕一区二区三区| 成人av在线电影| 欧美一级二级三级蜜桃| 亚洲人成网站影音先锋播放| 久久99国产精品久久| 91福利在线观看| 国产亚洲精品资源在线26u| 亚洲电影中文字幕在线观看| 国产成人av一区二区三区在线 | 天天操天天综合网| 成人做爰69片免费看网站| 在线91免费看| 中文字幕中文乱码欧美一区二区| 麻豆精品视频在线观看| 在线免费观看成人短视频| 久久久久久久久99精品| 日韩成人精品在线观看| 91丨porny丨国产| 久久久电影一区二区三区| 丝袜脚交一区二区| 91色视频在线| 久久久久久毛片| 日本欧美大码aⅴ在线播放| 色网综合在线观看| 日本一区二区在线不卡| 麻豆精品在线播放| 欧美日韩亚洲综合在线| 亚洲欧美综合网| 国产一区二区三区av电影| 91精品国产入口在线| 一级特黄大欧美久久久| 99麻豆久久久国产精品免费优播| 欧美精品一区在线观看| 在线观看91视频| 综合久久给合久久狠狠狠97色| 国产麻豆午夜三级精品| 日韩免费视频一区二区| 日韩电影网1区2区| 欧美日韩在线三区| 亚洲在线成人精品|