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To: Washington 9, From: Washington nie ® Re: 279A-WF-222936-USAMRIID, 01/06/2005 RYR 29 is a spore preparation acquired from Dr. Bruce E. Ivins, Bacteriology Division, U.S. edical Research Institute of fectious Diseases (USAMRIID), Fort Ds Maryland. ical bé x (NMRC), taken from b7c Pe eotution were returned to Dr. Ivins. bIF Within this time, a spgre viability count of the RMR 1029 at NMRC determined the viability to sequent to receiving the RMR 1029 ndependent and unaware of _NMRC's results performed a viability count and found it to Co A direct count was performed py. S—sid cn Special agent serial dilutions used to i jabili ound there to be What is not own, is the typical range of vil for Bacillus anthracis/Ames strain spore prep be addressed in i spore preparations of/the Ames strain of Bacillus anthracis, using different medial. Some insight can be gained into the range of viabilities across\ different media upon comparing the spore viability against total spore counts for each of these preparations.