This is a brief but depressing read from the CIA (a PDF document): http://www.fas.org/irp/cia/product/bw1103.pdf titled "The Darker Bioweapons Future"
Funny thing about the link, though, every time I've visited the page I had to either reload in order to make it display properly, or else go to the page http://www.fas.org/irp/cia/product/ and find the article's title on that page. It has not reliably linked for me when I attempt to go directly to the link.

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