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Working Copy Page 1 Precedence: ROUTINE Date: 8/05/2008 b6 b7C To: Washington Field. Attn: SA AMERITHRAX-2 From: Laboratory b6 ORs/ Hazardous Materials Response Unit b7C Contact: SSA Approved By: ALL INFORMATION CONTAINED b6 Drafted By: DATE 12-08-2008 BY 60324 UC BAW/DK/RYS b7C Case ID #: 279A-WF-222936-USAMRIID (Pending) Title: AMERITHRAX; MAJOR CASE 184; OO:WF. Synopsis: FBI Hazardous Materials Response Unit (HMRu) assets provided safety, scientific, and logistical support for the b6 searches of multiple sites at the United States Army Medical b7C Research Institute for Infectious Disease (UsAMRIID), Fort Detrick, Maryland and a single family residence to include up to vehicles located at military Road, Frederick, Maryland on November 1-2, 20o7 as requested by the Washington Field Division.. Reference: 279A-WF-222936-USAMRIID, Serial 1763. Details: The Washington Field Division provided the following background information to Hmru. Analysis of the spores used in the Fall 2oo1 anthrax attacks identified the organisms to be the Ames strain of Bacillus anthracis. The anthrax spore powders recovered from the anthrax letters addressed to the New York Post (Post) and Tom Brokaw (Brokaw) contain low levels of a non-anthracis Bacillus contaminant. The non- anthracis Bacillus contaminant has not been detected in the anthrax spore powders recovered from the envelopes mailed to either Senators Leahy or Daschle. Originally, the species of the non-anthracis Bacillus contaminant was incorrectly identified by multiple laboratories, however, upon thorough characterization and genetic sequencing, the contaminant was identified to be a strain of Bacillus subtilis. This is a significant factor for the search operations outlined herein. Since Bacillus organisms can be misidentified to belong to other Bacillus species, the guideline for the collection of cultures consistent with the Bacillus contaminant will be to collect Case ID : 279A-WF-222936-USAMRIID Serial : 1815