I know this isn't giving you much to go on. However, may I suggest to begin researching for yourself, you pick out some of the points mentioned below. For example, you could look up 'simian virus 40 (SV40)' or 'simian virus 40 (SV40) and 'acquired immunodeficiency disorder' and so on with the various terms mentioned in this paragraph. You won't be able to research this stuff forever. Things get 1984'd all the time.
Received 28 September 1999, Accepted 30 May 2000, Available online 25 May 2002.