One report today noted that a "BIOPSY" of the lesion had been done and that was the test result that had just came back. The fact that the individual had been responding to Cipro indicated that the "look" of the lesion was suspect and led to the biopsy. She/he is fortunate that the treatment was started early on and the anthrax neutralized
Anyone exposed to a suspicious powder deserves the same prompt treatment. Remember that the envelope contents tested negative but she/he had been exposed.