I'm not trying to sound snotty either...
I believe the push of CIPRO was mainly proposed by the drug companies, and it would not surprise me one bit if the people who were responsible for sending the bacillus were in fact related to the pharmaceutical companies, yes I know that sound very "Tin-Foil". Bacillus anthracis is susceptible to penicillin, doxycycline, and fluoroquinolones. Plenty of that stuff around.
I'm actually part of a distributed computing here:
http://www.d2ol.com/anthrax.html
Helping to evaluate potential drug candidates...