41.   In the old days, about the only way viruses were transmitted was through an infected computer program that you copied or downloaded.

42.   Infected female mosquitoes can transmit St. Louis encephalitis virus, a potential cause of inflammation of the brain and spinal cord.

43.   Instead, mosquitoes transmit the viruses to people who may become ill.

44.   It is at this point that she can transmit virus.

45.   Its early research suggested that a certain line of its pigs did not transmit the virus to human cells.

46.   Kissing, for example, or sharing drinking glasses or toothbrushes with HIV-infected people, are not considered risk factors for transmitting the virus.

47.   Like e-mail, instant messaging can be used to send spam and transmit viruses.

48.   Medical experts say, however, that the virus is not transmitted in such a manner.

49.   Most go to great lengths to avoid transmitting the virus.

50.   Mosquitoes then suck blood from the birds and can transmit the virus to humans.