11.   The previous spring, the virus had killed thousands of chickens in farms bordering southern China.

12.   The virus killed many of the horses, but no one died.

13.   The virus kills liver cells, which are then replaced by scar tissue.

14.   The virus was also killing some pigs, and Japanese encephalitis does not do that.

15.   The viruses were constantly killing enormous numbers of cells.

16.   The virus also kills chicken eggs, which Webster said could pose a problem if a vaccine becomes necessary, since chicken eggs are traditionally used in developing vaccines.

17.   The West Nile virus has killed crows, some sparrows and predatory birds such as hawks and eagles.

18.   The virus can only spread over a limited area, they say, because the virus kills much more rapidly than it can spread.

19.   The virus not only kills them but returns them to hollow-eyed, undead life.

20.   Unfortunately, many viruses can kill at much lower concentrations than this.