Don't you think that if Atta, Allah, Achmed, or Abdul were handling anthrax that they would have been taking preventive cipro or similar protective antibiotics , as to not get sick and draw attention to what could have otherwise been a viscious surprise anthrax attack? For this reason I feel that anthrax will be a home grown problem. I'm glad you asked that.
In August 2001, Atta and Al-Shehhi, the two WTC pilots, went into Huber Drugs in (I think) Delray Beach, FL. Most of the attention regarding this visit has been focused on Atta's complaint of raw, chemically-burned hands.
But I have always been fascinated by Al-Shehhi's complaint during the same visit: He complained of an apparent bad chest cold, and was directed to a walk-in medical clinic next door. He returned with a prescription for an antibiotic.
This clearly indicates that the 9/11 hijackers were not on antibiotics to start with, even after Al-Haznawi's June 22 or 23 emergency-room visit. Why this was calls for speculation. I would guess that there was an accident or an early mishandling of the material; the envelopes were probably not to be touched until just before 9/11, when infection would no longer be a problem.
I went to flight school in Florida. Most the students there are foreign, and most are of Middle East origin. All this wolf crying over foreigners in our flight schools is silly. They have been exclusively getting their flight training here since the late 60's. Atta going to a drug store looking for medical advise is exactly what they would be taught not to do if they were handling biohazardous material. They are dirty/smelly people who rarely wash their clothes. Getting a burning rash in Florida in August is not exactly a rare condition.
As a matter of fact, taking Cipro and going into the sun CAUSES a rash. It is one of those antibiotics that causes nasty photosensetivity.