51.   The virus also can affect humans who come in contact with blister fluid.

52.   The virus only very rarely affects humans and is not considered dangerous, producing flu-like symptoms and short-lived blisters.

53.   Foot-and-mouth, a livestock virus which does not affect humans, was first confirmed in Britain in February last year.

54.   As a result, over the past three days the eight astronauts ran through numerous tests on how long-term spaceflight affects humans in anticipation of the construction of Alpha.

55.   There are fears the meat could thus also affect humans.

56.   The strain itself is not known to affect humans, but US officials warned that it could mutate into something deadlier.

57.   Wales, Scotland and Northern Ireland have already been declared free of the disease, which does not affect humans.

58.   Over the past three days, the eight men have run through numerous tests on how long-term spaceflight affects humans.

59.   Scientists from both countries have stressed that that Reston strain does not affect humans.

60.   Swine fever is a highly contagious viral disease which is usually fatal for pigs but does not affect humans.