31.   Foot-and-mouth is spread by a highly contagious virus that infects cloven-hoofed animals such as cows, sheep and pigs.

32.   How the animals were infected was a mystery.

33.   It is extremely difficult to contain an outbreak of foot-and-mouth disease, which infects cloven-hoofed animals like sheep, cows and pigs.

34.   It is extremely difficult to contain an outbreak of foot-and-mouth disease, which infects cloven-hoofed animals such as sheep, cows and pigs.

35.   It is extremely difficult to contain an outbreak of the virus that infects cloven-hoofed animals like sheep, cows and pigs.

36.   Officials did not say how many animals were infected.

37.   Rabies-infected mice have been missing from a research laboratory for nearly a week, authorities said Friday, warning that the rodents could infect other animals.

38.   The experimental animals had been infected with venereal disease in order to try out new drugs, local officials said.

39.   The government is investigating how the animals became infected, the ministry said.

40.   They believe that all of them probably began with owners or veterinarians infecting the animals.