求一篇关于猪流感及保持健康的初三英语作文

不要经常依靠网上的啊 要多自己练练^_^ 给你提供一些材料吧 自己组织一下就应该OK了！

Swine influenza (also swine flu) refers to influenza caused by any strain of the influenza virus endemic in pigs (swine). Strains endemic in swine are called swine influenza virus (SIV).

Swine flu is common in swine and rare in humans. People who work with swine, especially people with intense exposures, are at risk of catching swine influenza if the swine carry a strain able to infect humans. However, these strains rarely are able to pass from human to human. Rarely, SIV mutates into a form able to pass easily from human to human. The strain responsible for the 2009 swine flu outbreak is believed to have undergone such a mutation.[1] This virus is named swine flu because one of its surface proteins is similar to viruses that usually infect pigs, but this strain is spreading in people and it is unknown if it infects pigs.

In humans, the symptoms of swine flu are similar to those of influenza and of influ