联合国警告新的禽流感病毒威胁

The United Nations is warning of a possible resurgence of the deadly bird flu virus, including a mutant strain that is spreading in Asia and elsewhere.The world body\'s Food and Agriculture Organization said Monday that a variant strain of the H5N1 virus ((known as H5N1 - 2.3.2.1)), which appears able to bypass the defenses of existing vaccines, has appeared in China and Vietnam.The agency also said bird flu has killed eight people in Cambodia this year, including a 6-year-old girl who died this month.

The H5N1 virus was first detected in 2003, and by the peak of the outbreak in 2006, had spread to 63 nations, before it was eradicated in most of those countries due to a mass culling of domestic poultry.But the virus continued to infect people in Bangladesh, China, Egypt, India, Indonesia and Vietnam. The agency says there were almost 800 cases of bird flu reported between 2010 and 2011. 

联合国警告说，一种致命的禽流感病毒可能再次引发疫情，包括一个正在亚洲和其它地区蔓延的突变株。联合国属下的世界粮食和农业组织星期一表示，在中国和越南出现H5N1禽流感病毒的一种突变株，能够避开现有的疫苗防御。该机构还说，这种禽流感今年在柬埔寨已造成8人死亡，包括一名本月死亡的6岁女孩。

H5N1病毒2003年首次被发现，并在2006年进入爆发高峰期，蔓延到63个国家。最后大多数国家通过大规模扑杀家禽而使其销声匿迹。但是这种病毒持续在孟加拉国、中国、埃及、印度、印度尼西亚和越南传播。世界粮食和农业组织说，在2010年和2011年间，有将近800个禽流感病例。