<tt id="6hsgl"><pre id="6hsgl"><pre id="6hsgl"></pre></pre></tt>
          <nav id="6hsgl"><th id="6hsgl"></th></nav>
          国产免费网站看v片元遮挡,一亚洲一区二区中文字幕,波多野结衣一区二区免费视频,天天色综网,久久综合给合久久狠狠狠,男人的天堂av一二三区,午夜福利看片在线观看,亚洲中文字幕在线无码一区二区

          CHINA> Backgrounder
          What are the consequences of outbreaks in poultry?
          (WHO)
          Updated: 2004-02-02 16:13
          Outbreaks of avian influenza, especially the highly pathogenic form, can be devastating for the poultry industry and for farmers. For example, an outbreak of highly pathogenic avian influenza in the USA in 1983-1984, largely confined to the state of Pennsylvania, resulted in the destruction of more than 17 million birds at a cost of nearly US$ 65 million. Economic consequences can be especially devastating in developing countries where poultry raising is an important source of income - and of food - for impoverished rural farmers and their families.

          When outbreaks become widespread within a country, control can be extremely difficult. For example, an outbreak that began in Mexico in 1992 was not completely controlled until 1995.

          For these reasons, government authorities usually undertake aggressive emergency control measures as soon as an outbreak is detected.


           

           

          主站蜘蛛池模板: a4yy私人毛片| 在线欧美精品一区二区三区| 亚洲午夜伦费影视在线观看| 国产综合有码无码中文字幕| 国产精品推荐一区二区| 亚洲av成人在线一区| 豆国产97在线 | 亚洲| 91偷自国产一区二区三区| 欧美裸体xxxx极品| 97人妻精品一区二区三区| 极品人妻少妇一区二区三区| 欧美成人看片黄A免费看| 精品视频国产香蕉尹人视频| 精品一卡2卡三卡4卡乱码精品视频| 99偷拍视频精品一区二区| 亚洲精品麻豆一区二区| 亚洲色播永久网址大全| 色综合久久综合香蕉色老大| 精品无套挺进少妇内谢| 欧美乱码卡一卡二卡四卡免费| 色狠狠色婷婷丁香五月| 精品人妻码一区二区三区| 国模一区二区三区私拍视频| 日本极品少妇videossexhd| 无码av中文字幕久久专区| 久久99精品久久久久麻豆 | 国内精品久久人妻无码不卡| 国产成人最新三级在线视频| 春雨电影大全免费观看| 99在线精品国自产拍中文字幕| 精品女同一区二区三区不卡| 亚洲综合日韩av在线| 粉嫩小少妇bwbwbw| 国偷自产一区二区三区在线视频| 国产人成77777视频网站| 国产激情福利短视频在线| 欧美孕妇乳喷奶水在线观看| 激情内射亚洲一区二区三区| 亚洲AV综合色区无码二区偷拍| 漂亮的人妻不敢呻吟被中出| 亚洲第一无码AV无码专区|