'The DNA sequence of the anthrax sent through the US mail in 2001 has been revealed and confirms suspicions that the bacteria originally came from a US military
laboratory. The data released uses codenames for the reference strains against which the attack strain was compared. The two reference strains that appear identical to the attack strain most likely originated at the US Army Medical Research Institute for Infectious Diseases at
Fort Detrick (USAMRIID), Maryland. The new work also shows that substantial genetic differences can emerge in two samples of an anthrax culture separated for only three years. This means the attacker's anthrax was not separated from its ancestors at
USAMRIID for many generations.'
[30] *snip*
Although the anthrax preparations were of different grades, all of the material derived from the same bacterial
strain. Known as the
Ames strain, it was first researched at the
U.S. Army Medical Research Institute of Infectious Diseases (
USAMRIID),
Fort Detrick,
Maryland. The Ames strain was then distributed to at least fifteen bio-research labs within the U.S. and six locations overseas.
*snip*
Source: http://en.wikipedia.org/wiki/2001_anthrax_attacks