The publication I had was very old (2002). Yet, I have learnt so much from this book. I'm even afraid to quote all facts, for the fear of being recognized as a terrorist.
The USA as the biggest creator and user of biological weapons refused to sign any international pacts to control development in this area. Creating biological weapons requires very high level of technology. The virus or other microbe has to be delivered in the form of aerosol, and the best way to do so is by a rocket (from the recent Israel developments in Gaza we know that US can be protected from rockets).
Quite interesting trifle is that plague in Europe was started by catapulting infected dead bodies to the Italian/French and other cities.
Aha, I'll tell you this secret. Anthrax attacks in US were not of terrorist making. Just one disgruntled employee of Defense Ministry, who probably didn't like very much what his country does in secret, decided to use it against politicians. I am not against America or Americans, but I can't help but say "oh, how typically American."