31.   Researchers do not know where the virus comes from, but when it flares up, it kills humans so fast that outbreaks usually only last a few weeks.

32.   The existing law has kept Britain free of rabies, a disease that can kill humans who are bitten by infected animals.

33.   They said elephants trained in this way are likely to attack or even kill humans.

34.   Winnie Kiiru of the Kenya Wildlife Service said in cases in which elephants that attack or kill humans can be identified, the animals are usually shot.

35.   Anthrax is a bacterial disease which can kill humans, but is usually only fatal in sheep and cattle.

36.   The radiation was strong enough to kill humans in one hour of exposure, it said.