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Cote, Christopher K; Buhr, Tony; Bernhards, Casey B; Bohmke, Matthew D; Calm, Alena M; Esteban-Trexler, Josephine S; Hunter, Melissa; Katoski, Sarah E; Kennihan, Neil; Klimko, Christopher P; Miller, Jeremy A; Minter, Zachary A; Pfarr, Jerry W; Prugh, Amber M; Quirk, Avery V; Rivers, Bryan A; Shea, April A; Shoe, Jennifer L; Sickler, Todd M; Young, Alice A; Fetterer, David P; Welkos, Susan L; Bozue, Joel A; McPherson, Derrell; Fountain, 3rd, Augustus W; Gibbons, Henry S
Applied and environmental microbiology, 06/2018, Letnik: 84, Številka: 12Journal Article
In 2015, a laboratory of the United States Department of Defense (DoD) inadvertently shipped preparations of gamma-irradiated spores of that contained live spores. In response, a systematic evidence-based method for preparing, concentrating, irradiating, and verifying the inactivation of spore materials was developed. We demonstrate the consistency of spore preparations across multiple biological replicates and show that two different DoD institutions independently obtained comparable dose-inactivation curves for a monodisperse suspension of spores containing 3 × 10 CFU. Spore preparations from three different institutions and three strain backgrounds yielded similar decimal reduction (D ) values and irradiation doses required to ensure sterility (D ) to the point at which the probability of detecting a viable spore is 10 Furthermore, spores of a genetically tagged strain of strain Sterne were used to show that high densities of dead spores suppress the recovery of viable spores. Together, we present an integrated method for preparing, irradiating, and verifying the inactivation of spores of for use as standard reagents for testing and evaluating detection and diagnostic devices and techniques. The inadvertent shipment by a U.S. Department of Defense (DoD) laboratory of live (anthrax) spores to U.S. and international destinations revealed the need to standardize inactivation methods for materials derived from biological select agents and toxins (BSAT) and for the development of evidence-based methods to prevent the recurrence of such an event. Following a retrospective analysis of the procedures previously employed to generate inactivated spores, a study was commissioned by the DoD to provide data required to support the production of inactivated spores for the biodefense community. The results of this work are presented in this publication, which details the method by which spores can be prepared, irradiated, and tested, such that the chance of finding residual living spores in any given preparation is 1/1,000,000. These irradiated spores are used to test equipment and methods for the detection of agents of biological warfare and bioterrorism.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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