"People tend to congregate and be together and the way the common cold virus is transmitted from one person to another is through handshakes,through sneezing, or coughing on one another."

VOA: special.2011.04.20

Ayala says malaria was likely first transmitted from chimpanzees to humans through a single mosquito.

VOA: standard.2010.04.05

and also intensify vaccination against all infectious agents, all viruses that are known to be strongly associated with the development of cancer. The government should increase its efforts to prevent illnesses with links to cancer, he says,such as hepatitis, a disease of the liver, and the human papillomavirus, which is transmitted during intercourse and is linked to cervical cancer.

VOA: standard.2010.06.16