All except for one thing--so far this unlucky soul is the only one who seems to have gotten it.
I understand that the incubation period can vary, and that we can't be sure yet. But any kind of attack would have gotten more than one person and even though somebody had to be the first to show symptoms, others would soon follow.
If we go another week or two without any more cases, I'd say it's highly likely that this is an incredible coincidence.
It seems hard to believe, but even the government couldn't cover up an anthrax outbreak.