Biological warfare is probably one of the more difficult paths to take anyway. To weaponise it and deliver it is very difficult. Its probably more effective as a scare tactic for the credulous newspaper readers.

>I took the plague shot back in the mid 80s and never had the followup shots because the first shot made me so sick I was hospitalized. Not a pleasant thought to think it may be used as a weapon.
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>>hrm. Didn't realize mortality rate was still that high.
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>>>Even with early treatment, the mortality rate is still 15%.
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>>>>Black Plague is very treatable and survivable these days, unless they're trying to mutate it
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>>>>>http://www.alarabiya.net/articles/2009/01/20/64603.html
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>>>>>Snippet:
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>>>>>At least 40 al-Qaeda operatives in Algeria died last week of the plague, the killer bug commonly known as the Black Death, prompting experts to speculate that al-Qaeda was developing the plague into a biological weapon to attack Western cities, according to press reports.