日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

WORLD> News
Top flu expert warns of a swine flu-bird flu mix
(Agencies)
Updated: 2009-05-08 17:16

MEXICO CITY -- Bird flu kills more than 60 percent of its human victims, but doesn't easily pass from person to person. Swine flu can be spread with a sneeze or handshake, but kills only a small fraction of the people it infects.

So what happens if they mix?

Top flu expert warns of a swine flu-bird flu mix
This Aug. 16, 1957, file photo of Dr. Joseph Ballinger giving Marjorie Hill, a nurse at Montefiore Hospital in New York, the first Asian flu vaccine shot to be administered in New York City. [Agencies]

This is the scenario that has some scientists worried: The two viruses meet -- possibly in Asia, where bird flu is endemic -- and combine into a new bug that is both highly contagious and lethal and can spread around the world.

Scientists are unsure how likely this possibility is, but note that the new swine flu strain -- a never-before-seen mixture of pig, human and bird viruses -- has shown itself to be especially adept at snatching evolutionarily advantageous genetic material from other flu viruses.

Special coverage:
A (H1N1) Influenza Outbreak
Related readings:
Top flu expert warns of a swine flu-bird flu mix 
Asian countries pledge common fight against flu
Top flu expert warns of a swine flu-bird flu mix WHO: Up to 2 billion people might get H1N1 flu
Top flu expert warns of a swine flu-bird flu mix Experts: Don't try 'pox party' for swine flu
Top flu expert warns of a swine flu-bird flu mix China warns of growing domestic flu risk
Top flu expert warns of a swine flu-bird flu mix SARS expert urges vigilance against A(H1N1) flu
"This particular virus seems to have this unique ability to pick up other genes," said leading virologist Dr. Robert Webster, whose team discovered an ancestor of the current flu virus at a North Carolina pig farm in 1998.

The current swine flu strain -- known as H1N1 -- has sickened more than 2,300 people in 24 countries. While people can catch bird flu from birds, the bird flu virus -- H5N1 -- does not easily jump from person to person. It has killed at least 258 people worldwide since it began to ravage poultry stocks in Asia in late 2003.

The World Health Organization reported two new human cases of bird flu on Wednesday. One patient is recovering in Egypt, while another died in Vietnam -- a reminder that the H5N1 virus is far from gone.

"Do not drop the ball in monitoring H5N1," WHO Director-General Margaret Chan told a meeting of Asia's top health officials in Bangkok on Friday by video link. "We have no idea how H5N1 will behave under the pressure of a pandemic."

Experts have long feared that bird flu could mutate into a form that spreads easily among people. The past three flu pandemics -- the 1918 Spanish flu, the 1957-58 Asian flu and the Hong Kong flu of 1968-69 -- were all linked to birds, though some scientists believe pigs also played a role in 1918.

   Previous page 1 2 Next Page  

主站蜘蛛池模板: 亚洲成人高清在线 | 一区二区免费在线观看视频 | 2020国产精品视频 | 免费看一级黄色大片 | 国产成人综合网 | 亚洲黄色在线免费观看 | 欧美成人免费一级人片100 | 中文字幕の友人北条麻妃 | 免费黄色资源 | 福利资源在线观看 | 黄色av免费观看 | 色视频在线观看 | 自拍偷拍亚洲 | 亚洲欧美精品在线 | 国产黄视频在线观看 | 五月婷婷视频在线观看 | 久久一区二 | 天堂在线观看av | 欧美一卡二卡在线观看 | 日本激情视频网站 | 久久国产精品影视 | 国产精品久久国产精品 | 成人福利视频在线观看 | 日韩欧美色图 | 中文成人在线 | 91少妇 | 久久久性视频 | 麻豆一区二区三区在线观看 | 国产玖玖视频 | 国产黄色在线观看 | 欧美精品久久久久久久久久 | 九九视频免费看 | 四虎网站在线观看 | 欧美色精品 | 成人午夜小视频 | 日本一本久草 | 91精品播放| 亚洲男人影院 | 天堂av资源在线 | 国产精品久久 | 精品久久影院 |