There are animal reservoirs for anthrax. I doubt that terrorists would infect one old guy and have done.
On the bright side, it shows that our medical system is on its toes for diagnosing and dealing with anthrax. And perhaps this will afford more doctors an opportunity for familiarizing themselves with the disease firsthand.
What about that Crop Duster that went missing the other day off the Bahamas? Not trying to be alarmist, but is that a method that could be used?