关于猪流感。

最近看了一些消息，发现人们对猪流感有一定的误解，认为猪流感就是从猪来的。

但是，事实是怎样的呢？

根据Wikipedia关于猪流感的文章：

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.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.

请注意一下上面引用中粗黑体：“这种病毒之所以命名为‘猪流感’是因为其表面蛋白和通常感染猪的病毒相似，但是这种病是在人之间传播的而且不知道是否会感染猪。”

也就是说目前并不能肯定猪流感是从猪而来，只观察到人与人的传播。所以，当你和一头猪接触或和一个人接触时，感染猪流感的概率是和人接触的高。:>

近日（2009-05-01），世卫组织已把猪流感重新命名为A型流感，以避免人们被误导。