現(xiàn)在有多少種豬流感病毒？中英文對照閱讀

　　What is Swine Influenza?

　　Swine Influenza (swine flu) is a respiratory disease of pigs caused by type A influenza virus that regularly causes outbreaks of influenza in pigs. Swine flu viruses cause high levels of illness and low death rates in pigs. Swine influenza viruses may circulate among swine throughout the year, but most outbreaks occur during the late fall and winter months similar to outbreaks in humans. The classical swine flu virus (an influenza type A H1N1 virus) was first isolated from a pig in 1930.

　　什么是豬流感？

　　豬流感(Swine Influenza, swine flu)是豬的一種呼吸道疾病，它的病原是一種能造成周期性爆發(fā)的A型流感病毒。豬流感病毒的致病率很高，但豬的死亡率低。豬流感病毒在全年都有可能傳播，但大部分會在深秋和冬季月份爆發(fā)，這一點與人流感類似。典型的豬流感病毒(A型H1N1病毒)于1930年第一次從豬身上分離出來。

　　How many swine flu viruses are there?

　　Like all influenza viruses, swine flu viruses change constantly. Pigs can be infected by avian influenza and human influenza viruses as well as swine influenza viruses. When influenza viruses from different species infect pigs, the viruses can reassort (i.e. swap genes) and new viruses that are a mix of swine, human and/or avian influenza viruses can emerge. Over the years, different variations of swine flu viruses have emerged. At this time, there are four main influenza type A virus subtypes that have been isolated in pigs: H1N1, H1N2, H3N2, and H3N1. However, most of the recently isolated influenza viruses from pigs have been H1N1 viruses.

　　現(xiàn)在有多少種豬流感病毒？

　　就像所有的流感病毒一樣，豬流感病毒也在不停地變化當中。禽流感，人流感以及豬流感病毒都會對豬造成感染；當不同種來源的流感病毒同時感染時，病毒之間就會重新“洗牌”(交換基因)，從而產(chǎn)生一種新的“禽人豬”混合病毒。隨著時間的推移，也出現(xiàn)了豬流感病毒的多種變種：現(xiàn)在人們從豬身上分離出了4種主要的A型流感病毒亞型： H1N1, H1N2, H3N2, H3N1。但最近從豬分離出來的流感病毒大部分都是H1N1型病毒。

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