英语新闻阅读：联合国警告新的禽流感病毒威胁

英语自学网

　　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.