This looks to be a good source:
http://www.hopkins-biodefense.org/pages/library/published.html
it has links to JAMA articles detailing the risks of individual
organisms.
I sent John an offlist note noting that I think the risk from
Yersinia Pestis (plague) is higher than that of smallpox.
One could base this entirely on the fact that producing large
numbers of bacteria is much easier (all you need is a fermentation
vat) than producing large numbers of virus particles that seem
to require animal or fowl hosts to manufacture the virus.
For low tech, I'd say its Anthrax, Yersinia or perhaps Tularemia
which is one of the most infectious bacteria known.
Robert
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