41.   Forestry experts have speculated that hikers and mountain bikers are spreading the disease by transferring infected particles from place to place on their boots or tires.

42.   Having sex with an infected person or sharing drug needles spreads the disease.

43.   He theorized that Wistar inadvertently added infected chimp cells to the monkey cells in their vaccine, thus spreading the disease to humans.

44.   He said USDA officials are investigating whether any wheat seed dealers may be responsible for spreading the disease.

45.   Health officials say sharing drinks, cigarettes or kissing could spread the disease.

46.   He said that hundreds of TB victims were awaiting admission to Mareensk, and in the meantime spreading the disease in other camps.

47.   However, even less susceptible fish can serve as carriers, and thus spread the disease to rainbow trout in mixed species watersheds such as the Delaware River.

48.   If commercial butterflies are spreading disease or corrupting scientific studies, they will probably do so without anyone ever knowing.

49.   In Africa, the disease is largely spread by heterosexual contact and tranmission from mother to child.