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. 2011 Mar 25;6(3):e17836. doi: 10.1371/journal.pone.0017836

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Samples had been maintained as suspensions of viable spores in sterile soil for approximately 60 years. The 1942 (left) and NRS-356 sample dated from 1944 (right) were found in the University of Wisconsin Department of Bacteriology strain collections. The 1952 sample (center) was returned to the Univ. of Wisconsin from Camp Detrick in 1952.