In the twenty-five years since that announcement, what we now know as AIDS has killed 20 million people (National AIDS Trust 2005). Where did the AIDS virus— and other emerging diseases, such as severe acute respiratory syndrome (SARS), Ebola, mad cow— come from?
Greger, M. (2007). Their bugs are worse than their bite: Emerging infectious disease and the human-animal interface. In D.J. Salem & A.N. Rowan (Eds.), The state of the animals 2007 (pp. 111-127). Washington, DC: Humane Society Press.