The NY Times just did a profile of a book where an epidemiologist explains where HIV came from and how it spread. There are a number of "accelerators" he discusses including the colonial public health service which was giving people shots with syringes that weren't cleaned properly...
It is interesting that he's tracked HIV back to about 1921. Apparently HIV2 has been around for a long time - it's milder and people can live with it (unmedicated) for decades...
http://www.nytimes.com/2011/10/18/health/18aids.html
It's a good read.



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