41.   It calls for slaughtering infected animals and authorizes the use of military personnel to restrict travel in a six-mile buffer zone around a disease site.

42.   It creates painful blisters in the feet and mouths of infected animals and leads to weight loss as well as a loss of milk in dairy cows.

43.   Instead, investigators inoculate animals with brain tissue from infected animals, tissue that contains prions but that may also contain viruses.

44.   It is rare to find infected animals in the United States, according to the CDC.

45.   It is these cells that are picked up along with blood when a mosquito bites an infected animal or person.

46.   It jumped to humans decades ago, they said, probably when infected animals were killed and eaten.

47.   It spreads when cattle are given feed containing parts of infected animals.

48.   Leptospirosis is a sometimes deadly disease caused by spiral-shaped bacteria of the genus Leptospira and is spread by contact with the urine of an infected animal.

49.   Mad cow disease is contracted by animals that eat the tissue of other infected animals.

50.   Mad cow disease is believed to have spread among cattle in Britain when nervous system tissue from infected animals was ground up in feed.