ZERO!here is an easy to read summary of the real evidence: <a href="http://www.avert.org/evidence.htm">http://www.avert.org/evidence.htm</a> [avert.org]And a more detailed summary: <a href="http://www.niaid.nih.gov/factsheets/evidhiv.htm">http://www.niaid.nih.gov/factsheets/evidhiv.htm</a> [nih.gov]Here are some of the proven, reviewed, science backed theories, quoted from the NIH site above:AIDS and HIV infection are invariably linked in time, place and population group.Many studies agree that only a s