2004年开春,一场高致病性禽流感疫情继“非典”之后肆虐世界。 禽流感又称真性鸡瘟或欧洲鸡瘟。最早于1878年在意大利发现。禽流感可分为高致病性、低致病性和非致病性禽流感三大类。被高致病性禽流感感染的鸡群常常全军覆没。今年,在亚洲国家出现的H5型与在美国出现的H7病毒均为高致病型病毒。禽流感主要在禽类之间传播,传染给人类的概率很小。 In the spring of 2004, a highly pathogenic bird flu epidemic hit the world after SARS. Bird flu is also called true chicken gizzard or European chicken gizzard. It was first discovered in Italy in 1878. Bird flu can be divided into three categories: highly pathogenic, low pathogenic and non-pathogenic avian influenza. Chickens infected with highly pathogenic bird flu are often wiped out. This year, the H5 type that appeared in Asian countries and the H7 virus that appeared in the United States are highly pathogenic viruses. Bird flu spreads mainly between birds and has a low probability of transmission to humans.