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Nguyen MCT, Nguyen HQ, Jang H, Noh S, Lee SY, Jang KS, Lee J, Sohn Y, Yee K, Jung H, Kim J. Sterilization effects of UV laser irradiation on Bacillus atrophaeus spore viability, structure, and proteins. Analyst 2021; 146:7682-7692. [PMID: 34812439 DOI: 10.1039/d1an01717a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Bacillus spores are highly resistant to toxic chemicals and extreme environments. Because some Bacillus species threaten public health, spore inactivation techniques have been intensively investigated. We exposed Bacillus atrophaeus spores to a 266 nm Nd:YVO4 laser at a laser power of 1 W and various numbers of scans. As a result, the UV laser reduced the viability of Bacillus atrophaeus spores. Although the outer coat of spores remained intact after UV laser irradiation of 720 scans, damage inside the spores was observed. Spore proteins were identified by matrix-assisted laser desorption/ionization Fourier transform ion cyclotron resonance mass spectrometry during the course of UV laser irradiation. Photochemical and photothermal processes are believed to be involved in the UV laser sterilization of Bacillus spores. Our findings suggest that a UV laser is capable of sterilizing Bacillus atrophaeus spores.
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Affiliation(s)
- My-Chi Thi Nguyen
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Huu-Quang Nguyen
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Hanbyeol Jang
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Sojung Noh
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Seong-Yeon Lee
- Department of Physics and Institute of Quantum Systems, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Kyoung-Soon Jang
- Biomedical Omics Center, Korea Basic Science Institute, Cheongju, Republic of Korea
| | - Jaebeom Lee
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea.,Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Youngku Sohn
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea.,Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Kiju Yee
- Department of Physics and Institute of Quantum Systems, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Heesoo Jung
- Chem-Bio Technology Center, Agency for Defense Development (ADD), Yuseong P.O. Box 35, Daejeon, 34186, Republic of Korea.
| | - Jeongkwon Kim
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea.,Graduate School of New Drug Discovery and Development, Chungnam National University, Daejeon, Republic of Korea.
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Papp S, Kimmerl K, Gatz J, Laue M, Grunow R, Kaspari O. Evaluation of Sporicidal Disinfectants for the Disinfection of Personal Protective Equipment During Biological Hazards. Health Secur 2020; 18:36-48. [PMID: 32078425 PMCID: PMC7047094 DOI: 10.1089/hs.2019.0128] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
A fast, effective, and safe disinfection of personal protective equipment (PPE) is vitally important for emergency forces involved in biological hazards. This study aimed to investigate a broad range of disinfectants to improve the established disinfection procedure. We analyzed the efficacy of chlorine-, peracetic acid–, and oxygen-based disinfectants against Bacillus spores on PPE. Therefore, spores of different Bacillus species were exposed to disinfectants on PPE material by using a standardized procedure covering the dried spores with disinfectants and applying mechanical distribution. Efficacy of disinfectants was quantified by determining the reduction factor (log10 levels) and number of viable spores left afterward. The chlorine-based granulate Hypochlorit CA G (2% chlorine) sufficiently inactivated Bacillus spores of risk groups 1 and 2, even with temperatures ranging from −20 to 35°C. Wofasteril® SC super (1.75% peracetic acid) achieved a reliable reduction of risk groups 1 and 2 and even fully virulent Bacillus spores by ≥5 log10 levels on PPE. With this, Hypochlorit-CA G and Wofasteril® SC super proved to be promising alternatives to the previously proven and widely used peracetic acid compound Wofasteril® (2% peracetic acid) for the disinfection of PPE when bacterial spores are known to be the contaminating agent. These results will help to improve the disinfection of PPE during biological hazards by providing new data on promising alternative compounds. A fast, effective, and safe disinfection of personal protective equipment (PPE) is vitally important for emergency forces involved in biological hazards. This study aimed to investigate a broad range of disinfectants to improve the established disinfection procedure. The authors analyzed the efficacy of chlorine-, peracetic acid-, and oxygen-based disinfectants against Bacillus spores on PPE.
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Affiliation(s)
- Stefanie Papp
- Dr. Stefanie Papp, Katharina Kimmerl, Jacob Gatz, Prof. Dr. Roland Grunow, and Dr. Oliver Kaspari are with the Centre for Biological Threats and Special Pathogens, Highly Pathogenic Microorganisms (ZBS 2); Dr. Michael Laue is with the Centre for Biological Threats and Special Pathogens, Advanced Light and Electron Microscopy (ZBS 4); all are with the Robert Koch Institute, Berlin, Germany
| | - Katharina Kimmerl
- Dr. Stefanie Papp, Katharina Kimmerl, Jacob Gatz, Prof. Dr. Roland Grunow, and Dr. Oliver Kaspari are with the Centre for Biological Threats and Special Pathogens, Highly Pathogenic Microorganisms (ZBS 2); Dr. Michael Laue is with the Centre for Biological Threats and Special Pathogens, Advanced Light and Electron Microscopy (ZBS 4); all are with the Robert Koch Institute, Berlin, Germany
| | - Jacob Gatz
- Dr. Stefanie Papp, Katharina Kimmerl, Jacob Gatz, Prof. Dr. Roland Grunow, and Dr. Oliver Kaspari are with the Centre for Biological Threats and Special Pathogens, Highly Pathogenic Microorganisms (ZBS 2); Dr. Michael Laue is with the Centre for Biological Threats and Special Pathogens, Advanced Light and Electron Microscopy (ZBS 4); all are with the Robert Koch Institute, Berlin, Germany
| | - Michael Laue
- Dr. Stefanie Papp, Katharina Kimmerl, Jacob Gatz, Prof. Dr. Roland Grunow, and Dr. Oliver Kaspari are with the Centre for Biological Threats and Special Pathogens, Highly Pathogenic Microorganisms (ZBS 2); Dr. Michael Laue is with the Centre for Biological Threats and Special Pathogens, Advanced Light and Electron Microscopy (ZBS 4); all are with the Robert Koch Institute, Berlin, Germany
| | - Roland Grunow
- Dr. Stefanie Papp, Katharina Kimmerl, Jacob Gatz, Prof. Dr. Roland Grunow, and Dr. Oliver Kaspari are with the Centre for Biological Threats and Special Pathogens, Highly Pathogenic Microorganisms (ZBS 2); Dr. Michael Laue is with the Centre for Biological Threats and Special Pathogens, Advanced Light and Electron Microscopy (ZBS 4); all are with the Robert Koch Institute, Berlin, Germany
| | - Oliver Kaspari
- Dr. Stefanie Papp, Katharina Kimmerl, Jacob Gatz, Prof. Dr. Roland Grunow, and Dr. Oliver Kaspari are with the Centre for Biological Threats and Special Pathogens, Highly Pathogenic Microorganisms (ZBS 2); Dr. Michael Laue is with the Centre for Biological Threats and Special Pathogens, Advanced Light and Electron Microscopy (ZBS 4); all are with the Robert Koch Institute, Berlin, Germany
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Cote CK, Weidner JM, Klimko C, Piper AE, Miller JA, Hunter M, Shoe JL, Hoover JC, Sauerbry BR, Buhr T, Bozue JA, Harbourt DE, Glass PJ. Biological Validation of a Chemical Effluent Decontamination System. APPLIED BIOSAFETY 2020. [DOI: 10.1177/1535676020937967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Introduction: Failure of an existing effluent decontamination system (EDS) prompted the consideration of commercial off-the-shelf solutions for decontamination of containment laboratory waste. A bleach-based chemical EDS was purchased to serve as an interim solution. Methods: Studies were conducted in the laboratory to validate inactivation of Bacillus spores with bleach in complex matrices containing organic simulants including fetal bovine serum, humic acid, and animal room sanitation effluent. Results: These studies demonstrated effective decontamination of >106 spores at a free chlorine concentration of ≥5700 parts per million with a 2-hour contact time. Translation of these results to biological validation of the bleach-based chemical EDS required some modifications to the system and its operation. Discussion: The chemical EDS was validated for the treatment of biosafety levels 3 and 4 waste effluent using laboratory-prepared spore packets along with commercial biological indicators; however, several issues and lessons learned identified during the process of onboarding are also discussed, including bleach product source, method of validation, dechlorination, and treated waste disposal.
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Affiliation(s)
- Christopher K. Cote
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, USA
| | - Jessica M. Weidner
- Medical Translational Sciences Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, USA
| | - Christopher Klimko
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, USA
| | - Ashley E. Piper
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, USA
| | - Jeremy A. Miller
- Biosafety Office, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, USA
| | - Melissa Hunter
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, USA
| | - Jennifer L. Shoe
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, USA
| | - Jennifer C. Hoover
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, USA
| | - Brian R. Sauerbry
- Logistics Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, USA
| | - Tony Buhr
- Naval Surface Warfare Center, Dahlgren Division, Dahlgren, VA, USA
| | - Joel A. Bozue
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, USA
| | - David E. Harbourt
- Biosafety Office, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, USA
| | - Pamela J. Glass
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD, USA
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Wood JP, Wendling M, Richter W, Rogers J. The use of ozone gas for the inactivation of Bacillus anthracis and Bacillus subtilis spores on building materials. PLoS One 2020; 15:e0233291. [PMID: 32437373 PMCID: PMC7241793 DOI: 10.1371/journal.pone.0233291] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 05/02/2020] [Indexed: 11/19/2022] Open
Abstract
A study was conducted to assess the efficacy of ozone gas in inactivating spores of both Bacillus anthracis and Bacillus subtilis inoculated onto six building materials (glass, wood, carpet, laminate, galvanized metal, and wallboard paper). Testing conditions consisted of ozone gas concentrations ranging from 7,000-12,000 parts per million (ppm), contact times from 4 to 12 h, and two relative humidity (RH) levels of 75 and 85%. Results showed that increasing the ozone concentration, contact time, and RH generally increased decontamination efficacy. The materials in which the highest decontamination efficacy was achieved for B. anthracis spores were wallboard paper, carpet, and wood with ≥ 6 log10 reduction (LR) occurring with 9,800 ppm ozone, 85% RH, for 6 h. The laminate and galvanized metal materials were generally more difficult to decontaminate, requiring 12,000 ppm ozone, 85% RH, and 9-12 h contact time to achieve ≥6 LR of B. anthracis. Lastly, overall, there were no significant differences in decontamination efficacy between the two species.
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Affiliation(s)
- Joseph P. Wood
- Office of Research and Development, U.S. Environmental Protection Agency, National Homeland Security Research Program, Research Triangle Park, North Carolina, United States of America
| | - Morgan Wendling
- Battelle Memorial Institute, Columbus, Ohio, United States of America
| | - William Richter
- Battelle Memorial Institute, Columbus, Ohio, United States of America
| | - James Rogers
- Battelle Memorial Institute, Columbus, Ohio, United States of America
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Lemmer K, Pauli G, Howaldt S, Schwebke I, Mielke M, Grunow R. Decontamination of Personal Protective Equipment. Health Secur 2019; 17:200-212. [PMID: 31173501 DOI: 10.1089/hs.2019.0005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Exploratory field analyses of the inactivation capacity of disinfectants on contaminated personal protective equipment (PPE) are required to select a suitable surrogate for biohazardous agents like spores of Bacillus anthracis. The objectives of our study were (1) the determination of an appropriate surrogate for the inactivation of spores of B. anthracis with peracetic acid (PAA), and (2) application of optimized inactivation conditions for an effective decontamination of PPE with PAA under field conditions. For inactivation studies, B. anthracis spores from different strains and B. thuringiensis spores were fixed by air drying on carriers prepared from PPE fabric. Time and concentration studies with PAA-based disinfectants revealed that the spores of the B. thuringiensis strain DSM 350 showed an inactivation profile comparable to that of the spores of the B. anthracis strain with the highest stability, implying that B. thuringiensis can serve as an appropriate surrogate. Rapid (3 to 5 minutes) and effective surface decontamination was achieved with 2% PAA/0.2% surfactant. In field studies, PPE contaminated with spores of B. thuringiensis was treated with the disinfectant. Optimizing the decontamination technique revealed that spraying in combination with brushing was effective within 5 minutes of exposure.
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Affiliation(s)
- Karin Lemmer
- Dr. Karin Lemmer is a scientist in the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; Professor Georg Pauli is the former Head of the Centre for Biological Threats and Special Pathogens; Sabine Howaldt is a medical technical assistant in the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; Dr. Ingeborg Schwebke is Deputy Head of the Unit Hospital Hygiene, Infection Prevention and Control, Department of Infectious Diseases; Professor Martin Mielke is Head of the Department of Infectious Diseases; and Professor Roland Grunow is Head of the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; all at the Robert Koch Institute, Berlin, Germany
| | - Georg Pauli
- Dr. Karin Lemmer is a scientist in the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; Professor Georg Pauli is the former Head of the Centre for Biological Threats and Special Pathogens; Sabine Howaldt is a medical technical assistant in the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; Dr. Ingeborg Schwebke is Deputy Head of the Unit Hospital Hygiene, Infection Prevention and Control, Department of Infectious Diseases; Professor Martin Mielke is Head of the Department of Infectious Diseases; and Professor Roland Grunow is Head of the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; all at the Robert Koch Institute, Berlin, Germany
| | - Sabine Howaldt
- Dr. Karin Lemmer is a scientist in the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; Professor Georg Pauli is the former Head of the Centre for Biological Threats and Special Pathogens; Sabine Howaldt is a medical technical assistant in the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; Dr. Ingeborg Schwebke is Deputy Head of the Unit Hospital Hygiene, Infection Prevention and Control, Department of Infectious Diseases; Professor Martin Mielke is Head of the Department of Infectious Diseases; and Professor Roland Grunow is Head of the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; all at the Robert Koch Institute, Berlin, Germany
| | - Ingeborg Schwebke
- Dr. Karin Lemmer is a scientist in the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; Professor Georg Pauli is the former Head of the Centre for Biological Threats and Special Pathogens; Sabine Howaldt is a medical technical assistant in the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; Dr. Ingeborg Schwebke is Deputy Head of the Unit Hospital Hygiene, Infection Prevention and Control, Department of Infectious Diseases; Professor Martin Mielke is Head of the Department of Infectious Diseases; and Professor Roland Grunow is Head of the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; all at the Robert Koch Institute, Berlin, Germany
| | - Martin Mielke
- Dr. Karin Lemmer is a scientist in the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; Professor Georg Pauli is the former Head of the Centre for Biological Threats and Special Pathogens; Sabine Howaldt is a medical technical assistant in the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; Dr. Ingeborg Schwebke is Deputy Head of the Unit Hospital Hygiene, Infection Prevention and Control, Department of Infectious Diseases; Professor Martin Mielke is Head of the Department of Infectious Diseases; and Professor Roland Grunow is Head of the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; all at the Robert Koch Institute, Berlin, Germany
| | - Roland Grunow
- Dr. Karin Lemmer is a scientist in the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; Professor Georg Pauli is the former Head of the Centre for Biological Threats and Special Pathogens; Sabine Howaldt is a medical technical assistant in the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; Dr. Ingeborg Schwebke is Deputy Head of the Unit Hospital Hygiene, Infection Prevention and Control, Department of Infectious Diseases; Professor Martin Mielke is Head of the Department of Infectious Diseases; and Professor Roland Grunow is Head of the Unit Highly Pathogenic Microorganisms, Centre for Biological Threats and Special Pathogens; all at the Robert Koch Institute, Berlin, Germany
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Wood JP, Adrion AC. Review of Decontamination Techniques for the Inactivation of Bacillus anthracis and Other Spore-Forming Bacteria Associated with Building or Outdoor Materials. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:4045-4062. [PMID: 30901213 PMCID: PMC6547374 DOI: 10.1021/acs.est.8b05274] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Since the intentional release of Bacillus anthracis spores through the U.S. Postal Service in the fall of 2001, research and development related to decontamination for this biological agent have increased substantially. This review synthesizes the advances made relative to B. anthracis spore decontamination science and technology since approximately 2002, referencing the open scientific literature and publicly available, well-documented scientific reports. In the process of conducting this review, scientific knowledge gaps have also been identified. This review focuses primarily on techniques that are commercially available and that could potentially be used in the large-scale decontamination of buildings and other structures, as well as outdoor environments. Since 2002, the body of scientific data related to decontamination and microbial sterilization has grown substantially, especially in terms of quantifying decontamination efficacy as a function of several factors. Specifically, progress has been made in understanding how decontaminant chemistry, the materials the microorganisms are associated with, environmental factors, and microbiological methods quantitatively impact spore inactivation. While advancement has been made in the past 15 years to further the state of the science in the inactivation of bacterial spores in a decontamination scenario, further research is warranted to close the scientific gaps that remain.
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Affiliation(s)
- Joseph P. Wood
- United States Environmental Protection Agency, Offce of Research and Development, National Homeland Security Research Center, Research Triangle Park, North Carolina United States
- Corresponding Author: Phone: (919) 541-5029;
| | - Alden Charles Adrion
- United States Environmental Protection Agency, Offce of Research and Development, National Homeland Security Research Center, Research Triangle Park, North Carolina United States
- Oak Ridge Institute for Science and Education Postdoctoral Fellow, Oak Ridge, Tennessee 37830, United States
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Silva HO, Lima JAS, Aguilar CEG, Rossi GAM, Mathias LA, Vidal AMC. Efficiency of Different Disinfectants on Bacillus cereus Sensu Stricto Biofilms on Stainless-Steel Surfaces in Contact With Milk. Front Microbiol 2018; 9:2934. [PMID: 30555449 PMCID: PMC6280812 DOI: 10.3389/fmicb.2018.02934] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 11/14/2018] [Indexed: 01/28/2023] Open
Abstract
The species of the Bacillus cereus group have the ability to adhere to and form biofilms on solid surfaces, including stainless steel, a material widely used in food industries. Biofilms allow for recontamination during food processing, and the "clean-in-place" (CIP) system is largely used by industries to control them. This study thus proposes to evaluate the efficacy of peracetic acid and sodium hypochlorite against biofilms induced on stainless-steel surfaces. The SAMN07414939 isolate (BioProject PRJNA390851), a recognized biofilm producer, was selected for biofilm induction on AISI 304 stainless steel. Biofilm induction was performed and classified into three categories: TCP (Tindalized, Contaminated, and Pasteurized milk), TCS (Tindalized milk Contaminated with Spores), and TCV (Tindalized milk Contaminated with Vegetative cells). Subsequently, the coupons were sanitized simulating a CIP procedure, on a pilot scale, using alkaline and acid solutions followed by disinfectants (peracetic acid and sodium hypochlorite). Microorganism adhesion on the surfaces reached 6.3 × 105 to 3.1 × 107 CFU/cm-2. Results did not show significant differences (p > 0.05) for surface adhesion between the three tested categories (TCP, TCS, and TCV) or (p > 0.05) between the two disinfectants (peracetic acid and sodium hypochlorite). Microbial populations adhered to the stainless-steel coupons are equally reduced after treatment with peracetic acid and sodium hypochlorite, with no differences in the control of B. cereus s.s. biofilms on AISI 304 stainless-steel surfaces.
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Affiliation(s)
- Higor Oliveira Silva
- Department of Preventive Veterinary Medicine and Animal Reproduction, School of Agrarian and Veterinarian Sciences, São Paulo State University, São Paulo, Brazil
| | - Joyce Aparecida Santos Lima
- Department of Preventive Veterinary Medicine and Animal Reproduction, School of Agrarian and Veterinarian Sciences, São Paulo State University, São Paulo, Brazil
| | - Carlos Eduardo Gamero Aguilar
- Department of Preventive Veterinary Medicine and Animal Reproduction, School of Agrarian and Veterinarian Sciences, São Paulo State University, São Paulo, Brazil
| | - Gabriel Augusto Marques Rossi
- Department of Preventive Veterinary Medicine and Animal Reproduction, School of Agrarian and Veterinarian Sciences, São Paulo State University, São Paulo, Brazil
| | - Luis Antonio Mathias
- Department of Preventive Veterinary Medicine and Animal Reproduction, School of Agrarian and Veterinarian Sciences, São Paulo State University, São Paulo, Brazil
| | - Ana Maria Centola Vidal
- Department of Veterinary Medicine, School of Animal Science and Food Engineering, University of São Paulo, São Paulo, Brazil
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A Standard Method To Inactivate Bacillus anthracis Spores to Sterility via Gamma Irradiation. Appl Environ Microbiol 2018; 84:AEM.00106-18. [PMID: 29654186 DOI: 10.1128/aem.00106-18] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 04/05/2018] [Indexed: 12/19/2022] Open
Abstract
In 2015, a laboratory of the United States Department of Defense (DoD) inadvertently shipped preparations of gamma-irradiated spores of Bacillus anthracis 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 B. anthracis spores containing 3 × 1010 CFU. Spore preparations from three different institutions and three strain backgrounds yielded similar decimal reduction (D10) values and irradiation doses required to ensure sterility (DSAL) to the point at which the probability of detecting a viable spore is 10-6 Furthermore, spores of a genetically tagged strain of B. anthracis 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 B. anthracis for use as standard reagents for testing and evaluating detection and diagnostic devices and techniques.IMPORTANCE The inadvertent shipment by a U.S. Department of Defense (DoD) laboratory of live Bacillus anthracis (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 B. anthracis 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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Plaut RD, Staab AB, Munson MA, Gebhardt JS, Klimko CP, Quirk AV, Cote CK, Buhr TL, Rossmaier RD, Bernhards RC, Love CE, Berk KL, Abshire TG, Rozak DA, Beck LC, Stibitz S, Goodwin BG, Smith MA, Sozhamannan S. Avirulent Bacillus anthracis Strain with Molecular Assay Targets as Surrogate for Irradiation-Inactivated Virulent Spores. Emerg Infect Dis 2018; 24. [PMID: 29553922 PMCID: PMC5875273 DOI: 10.3201/eid2404.171646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The revelation in May 2015 of the shipment of γ irradiation–inactivated wild-type Bacillus anthracis spore preparations containing a small number of live spores raised concern about the safety and security of these materials. The finding also raised doubts about the validity of the protocols and procedures used to prepare them. Such inactivated reference materials were used as positive controls in assays to detect suspected B. anthracis in samples because live agent cannot be shipped for use in field settings, in improvement of currently deployed detection methods or development of new methods, or for quality assurance and training activities. Hence, risk-mitigated B. anthracis strains are needed to fulfill these requirements. We constructed a genetically inactivated or attenuated strain containing relevant molecular assay targets and tested to compare assay performance using this strain to the historical data obtained using irradiation-inactivated virulent spores.
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Lemmer K, Howaldt S, Heinrich R, Roder A, Pauli G, Dorner B, Pauly D, Mielke M, Schwebke I, Grunow R. Test methods for estimating the efficacy of the fast-acting disinfectant peracetic acid on surfaces of personal protective equipment. J Appl Microbiol 2017; 123:1168-1183. [DOI: 10.1111/jam.13575] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 07/31/2017] [Accepted: 08/03/2017] [Indexed: 11/27/2022]
Affiliation(s)
- K. Lemmer
- Centre for Biological Threats and Special Pathogens; Robert Koch Institute; Berlin Germany
| | - S. Howaldt
- Centre for Biological Threats and Special Pathogens; Robert Koch Institute; Berlin Germany
| | - R. Heinrich
- Centre for Biological Threats and Special Pathogens; Robert Koch Institute; Berlin Germany
| | - A. Roder
- Centre for Biological Threats and Special Pathogens; Robert Koch Institute; Berlin Germany
| | - G. Pauli
- Centre for Biological Threats and Special Pathogens; Robert Koch Institute; Berlin Germany
| | - B.G. Dorner
- Centre for Biological Threats and Special Pathogens; Robert Koch Institute; Berlin Germany
| | - D. Pauly
- Centre for Biological Threats and Special Pathogens; Robert Koch Institute; Berlin Germany
| | - M. Mielke
- Applied Infection Control and Hospital Hygiene; Robert Koch Institute; Berlin Germany
| | - I. Schwebke
- Applied Infection Control and Hospital Hygiene; Robert Koch Institute; Berlin Germany
| | - R. Grunow
- Centre for Biological Threats and Special Pathogens; Robert Koch Institute; Berlin Germany
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Mott T, Shoe J, Hunter M, Woodson A, Fritts K, Klimko C, Quirk A, Welkos S, Cote C. Comparison of sampling methods to recover germinatedBacillus anthracisandBacillus thuringiensisendospores from surface coupons. J Appl Microbiol 2017; 122:1219-1232. [DOI: 10.1111/jam.13418] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Revised: 02/03/2017] [Accepted: 02/04/2017] [Indexed: 11/26/2022]
Affiliation(s)
- T.M. Mott
- Bacteriology Division; United States Army Medical Research Institute of Infectious Disease (USAMRIID); Frederick MD USA
| | - J.L. Shoe
- Bacteriology Division; United States Army Medical Research Institute of Infectious Disease (USAMRIID); Frederick MD USA
| | - M. Hunter
- Bacteriology Division; United States Army Medical Research Institute of Infectious Disease (USAMRIID); Frederick MD USA
| | - A.M. Woodson
- Bacteriology Division; United States Army Medical Research Institute of Infectious Disease (USAMRIID); Frederick MD USA
| | - K.A. Fritts
- Bacteriology Division; United States Army Medical Research Institute of Infectious Disease (USAMRIID); Frederick MD USA
| | - C.P. Klimko
- Bacteriology Division; United States Army Medical Research Institute of Infectious Disease (USAMRIID); Frederick MD USA
| | - A.V. Quirk
- Bacteriology Division; United States Army Medical Research Institute of Infectious Disease (USAMRIID); Frederick MD USA
| | - S.L. Welkos
- Bacteriology Division; United States Army Medical Research Institute of Infectious Disease (USAMRIID); Frederick MD USA
| | - C.K. Cote
- Bacteriology Division; United States Army Medical Research Institute of Infectious Disease (USAMRIID); Frederick MD USA
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12
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Buhr TL, Young AA, Bensman M, Minter ZA, Kennihan NL, Johnson CA, Bohmke MD, Borgers-Klonkowski E, Osborn EB, Avila SD, Theys AMG, Jackson PJ. Hot, humid air decontamination of a C-130 aircraft contaminated with spores of two acrystalliferous Bacillus thuringiensis strains, surrogates for Bacillus anthracis. J Appl Microbiol 2016; 120:1074-84. [PMID: 26786717 DOI: 10.1111/jam.13055] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Revised: 12/13/2015] [Accepted: 12/31/2015] [Indexed: 11/29/2022]
Abstract
AIM To develop test methods and evaluate survival of Bacillus thuringiensis kurstaki cry(-) HD-1 and B. thuringiensis Al Hakam spores after exposure to hot, humid air inside of a C-130 aircraft. METHODS AND RESULTS Bacillus thuringiensis spores were either pre-inoculated on 1 × 2 or 2 × 2 cm substrates or aerosolized inside the cargo hold of a C-130 and allowed to dry. Dirty, complex surfaces (10 × 10 cm) swabbed after spore dispersal showed a deposition of 8-10 log10 m(-2) through the entire cargo hold. After hot, humid air decontamination at 75-80°C, 70-90% relative humidity for 7 days, 87 of 98 test swabs covering 0·98 m(2) , showed complete spore inactivation. There was a total of 1·67 log10 live CFU detected in 11 of the test swabs. Spore inactivation in the 98 test swabs was measured at 7·06 log10 m(-2) . CONCLUSIONS Laboratory test methods for hot, humid air decontamination were scaled for a large-scale aircraft field test. The C-130 field test demonstrated that hot, humid air can be successfully used to decontaminate an aircraft. SIGNIFICANCE AND IMPACT OF THE STUDY Transition of a new technology from research and development to acquisition at a Technology Readiness Level 7 is unprecedented.
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Affiliation(s)
- T L Buhr
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - A A Young
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - M Bensman
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - Z A Minter
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - N L Kennihan
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - C A Johnson
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - M D Bohmke
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - E Borgers-Klonkowski
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - E B Osborn
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - S D Avila
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | | | - P J Jackson
- Lawrence Livermore National Laboratory, Livermore, CA, USA
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13
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Josefiova J, Pospisek M, Vanek D. Decontamination by Persteril 36 may affect the reliability of DNA-based detection of biological warfare agents-short communication. Folia Microbiol (Praha) 2016; 61:417-21. [PMID: 26910525 DOI: 10.1007/s12223-016-0451-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 02/05/2016] [Indexed: 11/26/2022]
Abstract
Persteril 36 is a disinfectant with a broad spectrum of antimicrobial activity. Because of its bactericidal, virucidal, fungicidal, and sporicidal effectiveness, it is used as a disinfectant against biological warfare agents in the emergency and army services. In case of an attack with potentially harmful biological agents, a person's gear or afflicted skin is sprayed with a diluted solution of Persteril 36 as a precaution. Subsequently, the remains of the biological agents are analyzed. However, the question remains concerning whether DNA can be successfully analyzed from Persteril 36-treated dead bacterial cells. Spore-forming Bacillus subtilis and Gram-negative Pseudomonas aeruginosa and Xanthomonas campestris were splattered on a camouflage suit and treated with 2 or 0.2 % Persteril 36. After the disinfectant vaporized, the bacterial DNA was extracted and quantified by real-time PCR. A sufficient amount of DNA was recovered for downstream analysis only in the case of spore-forming B. subtilis treated with a 0.2 % solution of Persteril 36. The bacterial DNA was almost completely destroyed in Gram-negative bacteria or after treatment with the more concentrated solution in B. subtilis. This phenomenon can lead to false-negative results during the identification of harmful microorganisms.
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Affiliation(s)
- Jirina Josefiova
- Forensic DNA Service, s.r.o., Janovskeho 18, Prague 7, 170 00, Czech Republic
| | - Martin Pospisek
- Faculty of Science, Charles University in Prague, Albertov 6, Prague, 128 43, Czech Republic
- Biologicals s.r.o., Sramkova 315/10, 251 01, Ricany, Czech Republic
| | - Daniel Vanek
- Forensic DNA Service, s.r.o., Janovskeho 18, Prague 7, 170 00, Czech Republic.
- 2nd Faculty of Medicine, Charles University in Prague, V Uvalu 84, Prague, 150 06, Czech Republic.
- Nemocnice Na Bulovce, Institute of Legal Medicine, Budinova 2, Prague 8, 180 81, Czech Republic.
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14
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Setlow B, Korza G, Blatt KM, Fey JP, Setlow P. Mechanism of Bacillus subtilis spore inactivation by and resistance to supercritical CO2 plus peracetic acid. J Appl Microbiol 2016; 120:57-69. [PMID: 26535794 PMCID: PMC4715516 DOI: 10.1111/jam.12995] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Revised: 10/22/2015] [Accepted: 10/27/2015] [Indexed: 10/22/2022]
Abstract
AIMS Determine how supercritical CO2 (scCO2 ) plus peracetic acid (PAA) inactivates Bacillus subtilis spores, factors important in spore resistance to scCO2 -PAA, and if spores inactivated by scCO2 -PAA are truly dead. METHODS AND RESULTS Spores of wild-type B. subtilis and isogenic mutants lacking spore protective proteins were treated with scCO2 -PAA in liquid or dry at 35°C. Wild-type wet spores (aqueous suspension) were more susceptible than dry spores. Treated spores were examined for viability (and were truly dead), dipicolinic acid (DPA), mutations, permeability to nucleic acid stains, germination under different conditions, energy metabolism and outgrowth. ScCO2 -PAA-inactivated spores retained DPA, and survivors had no notable DNA damage. However, DPA was released from inactivated spores at a normally innocuous temperature (85°C), and colony formation from treated spores was salt sensitive. The inactivated spores germinated but did not outgrow, and these germinated spores had altered plasma membrane permeability and defective energy metabolism. Wet or dry coat-defective spores had increased scCO2 -PAA sensitivity, and dry spores but not wet spores lacking DNA protective proteins were more scCO2 -PAA sensitive. CONCLUSIONS These findings suggest that scCO2 -PAA inactivates spores by damaging spores' inner membrane. The spore coat provided scCO2 -PAA resistance for both wet and dry spores. DNA protective proteins provided scCO2 -PAA resistance only for dry spores. SIGNIFICANCE AND IMPACT OF THE STUDY These results provide information on mechanisms of spore inactivation of and resistance to scCO2 -PAA, an agent with increasing use in sterilization applications.
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Affiliation(s)
- Barbara Setlow
- Department of Molecular Biology and Biophysics, UConn Health, Farmington, CT 06030-3305 USA
| | - George Korza
- Department of Molecular Biology and Biophysics, UConn Health, Farmington, CT 06030-3305 USA
| | | | | | - Peter Setlow
- Department of Molecular Biology and Biophysics, UConn Health, Farmington, CT 06030-3305 USA
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15
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Buhr TL, Young AA, Barnette HK, Minter ZA, Kennihan NL, Johnson CA, Bohmke MD, DePaola M, Cora-Laó M, Page MA. Test methods and response surface models for hot, humid air decontamination of materials contaminated with dirty spores of Bacillus anthracis ∆Sterne and Bacillus thuringiensis Al Hakam. J Appl Microbiol 2015; 119:1263-77. [PMID: 26258399 DOI: 10.1111/jam.12928] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Revised: 07/21/2015] [Accepted: 07/22/2015] [Indexed: 11/26/2022]
Abstract
AIMS To develop test methods and evaluate survival of Bacillus anthracis ∆Sterne or Bacillus thuringiensis Al Hakam on materials contaminated with dirty spore preparations after exposure to hot, humid air using response surface modelling. METHODS AND RESULTS Spores (>7 log10 ) were mixed with humic acid + spent sporulation medium (organic debris) or kaolin (dirt debris). Spore samples were then dried on five different test materials (wiring insulation, aircraft performance coating, anti-skid, polypropylene, and nylon). Inoculated materials were tested with 19 test combinations of temperature (55, 65, 75°C), relative humidity (70, 80, 90%) and time (1, 2, 3 days). The slowest spore inactivation kinetics was on nylon webbing and/or after addition of organic debris. CONCLUSIONS Hot, humid air effectively decontaminates materials contaminated with dirty Bacillus spore preparations; debris and material interactions create complex decontamination kinetic patterns; and B. thuringiensis Al Hakam is a realistic surrogate for B. anthracis. SIGNIFICANCE AND IMPACT OF THE STUDY Response surface models of hot, humid air decontamination were developed which may be used to select decontamination parameters for contamination scenarios including aircraft.
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Affiliation(s)
- T L Buhr
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - A A Young
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - H K Barnette
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - Z A Minter
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - N L Kennihan
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - C A Johnson
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - M D Bohmke
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - M DePaola
- Naval Surface Warfare Center-Dahlgren Division, CBR Concepts and Experimentation Branch (Z21), Dahlgren, VA, USA
| | - M Cora-Laó
- United States Army Corps of Engineers Research and Development Center, Champaign, IL, USA
| | - M A Page
- United States Army Corps of Engineers Research and Development Center, Champaign, IL, USA
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16
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Omotade TO, Bernhards RC, Klimko CP, Matthews ME, Hill AJ, Hunter MS, Webster WM, Bozue JA, Welkos SL, Cote CK. The impact of inducing germination of Bacillus anthracis and Bacillus thuringiensis spores on potential secondary decontamination strategies. J Appl Microbiol 2014; 117:1614-33. [PMID: 25196092 DOI: 10.1111/jam.12644] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 09/03/2014] [Accepted: 09/03/2014] [Indexed: 12/22/2022]
Abstract
AIMS Decontamination and remediation of a site contaminated by the accidental or intentional release of fully virulent Bacillus anthracis spores are difficult, costly and potentially damaging to the environment. Development of novel decontamination strategies that have minimal environmental impacts remains a high priority. Although ungerminated spores are amongst the most resilient organisms known, once exposed to germinants, the germinating spores, in some cases, become susceptible to antimicrobial environments. We evaluated the concept that once germinated, B. anthracis spores would be less hazardous and significantly easier to remediate than ungerminated dormant spores. METHODS AND RESULTS Through in vitro germination and sensitivity assays, we demonstrated that upon germination, B. anthracis Ames spores and Bacillus thuringiensis Al Hakam spores (serving as a surrogate for B. anthracis) become susceptible to environmental stressors. The majority of these germinated B. anthracis and B. thuringiensis spores were nonviable after exposure to a defined minimal germination-inducing solution for prolonged periods of time. Additionally, we examined the impact of potential secondary disinfectant strategies including bleach, hydrogen peroxide, formaldehyde and artificial UV-A, UV-B and UV-C radiation, employed after a 60-min germination-induction step. Each secondary disinfectant employs a unique mechanism of killing; as a result, germination-induction strategies are better suited for some secondary disinfectants than others. CONCLUSIONS These results provide evidence that the deployment of an optimal combination strategy of germination-induction/secondary disinfection may be a promising aspect of wide-area decontamination following a B. anthracis contamination event. SIGNIFICANCE AND IMPACT OF THE STUDY By inducing spores to germinate, our data confirm that the resulting cells exhibit sensitivities that can be leveraged when paired with certain decontamination measures. This increased susceptibility could be exploited to devise more efficient and safe decontamination measures and may obviate the need for more stringent methods that are currently in place.
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Affiliation(s)
- T O Omotade
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), Frederick, MD, USA
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Buhr TL, Young AA, Johnson CA, Minter ZA, Wells CM. Decontamination of materials contaminated with Francisella philomiragia or MS2 bacteriophage using PES-Solid, a solid source of peracetic acid. J Appl Microbiol 2014; 117:397-404. [PMID: 24807242 DOI: 10.1111/jam.12540] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2014] [Revised: 04/23/2014] [Accepted: 04/30/2014] [Indexed: 10/25/2022]
Abstract
AIM The aim of the study was to develop test methods and evaluate survival of Francisella philomiragia cells and MS2 bacteriophage after exposure to PES-Solid (a solid source of peracetic acid) formulations with or without surfactants. METHODS AND RESULTS Francisella philomiragia cells (≥7·6 log10 CFU) or MS2 bacteriophage (≥6·8 log10 PFU) were deposited on seven different test materials and treated with three different PES-Solid formulations, three different preneutralized samples and filter controls at room temperature for 15 min. There were 0-1·3 log10 CFU (<20 cells) of cell survival, or 0-1·7 log10 (<51 PFU) of bacteriophage survival in all 21 test combinations (organism, formulation and substrate) containing reactive PES-Solid. In addition, the microemulsion (Dahlgren Surfactant System) showed ≤2 log10 (100 cells) of viable F. philomiragia cells, indicating the microemulsion achieved <2 log10 CFU on its own. CONCLUSIONS Three PES-Solid formulations and one microemulsion system (DSS) inactivated F. philomiragia cells and/or MS2 bacteriophage that were deposited on seven different materials. SIGNIFICANCE AND IMPACT OF THE STUDY A test method was developed to show that reactive PES-Solid formulations and a microemulsion system (DSS) inactivated >6 log10 CFU/PFU F. philomiragia cells and/or MS2 bacteriophage on different materials.
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Affiliation(s)
- T L Buhr
- CBR Concepts and Experimentation Branch (Z21), Naval Surface Warfare Center, Dahlgren Division, Dahlgren, VA, USA
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