Surrogate Testing Suggests That Chlorine Dioxide Gas Exposure Would Not Inactivate Ebola Virus Contained in Environmental Blood Contamination

John-Martin J Lowe, Angela L Hewlett, Peter Charles Iwen, Philip W. Smith, Shawn G. Gibbs

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The ability to decontaminate a room potentially containing the Ebola virus is important to healthcare facilities in the United States. The Ebola virus remains viable in body fluids, a room that has housed a patient with Ebola virus disease must have all surfaces manually wiped with an approved disinfectant, which increases occupational exposure risk. This study evaluated the efficacy of gaseous chlorine dioxide inactivation of bacterial organisms in blood as the Ebola virus surrogates and as the organisms used by the Nebraska Biocontainment Unit to provide the margin of safety for decontamination. Bacillus anthracis, Escherichia coli, Enterococcus faecalis, and Mycobacterium smegmatis blood suspensions that were exposed to ClO<inf>2</inf> gas concentrations and exposure limits. The log reduction in Colony Forming Units (CFU) was determined for each bacterial blood suspension. Exposure parameters approximating industry practices for ClO<inf>2</inf> environmental decontamination (360 ppm concentration to 780 ppm-hr exposure, 65% relative humidity) as well as parameters exceeding current practice (1116 ppm concentration to 1400 ppm-hr exposure; 1342 ppm concentration to 1487 ppm-hr exposure) were evaluated. Complete inactivation was not achieved for any of the bacterial blood suspensions tested. Reductions were observed in concentrations of B. anthracis spores (1.3-3.76 log) and E. faecalis vegetative cells (1.3 log) whereas significant reductions in vegetative cell concentrations for E. coli and M. smegmatis blood suspensions were not achieved. Our results showed that bacteria in the presence of blood were not inactivated using gaseous ClO<inf>2</inf> decontamination. ClO<inf>2</inf> decontamination alone should not be used for the Ebola virus, but decontamination processes should first include manual wiping of potentially contaminated blood; especially for microorganisms as infectious as the Ebola virus.

Original languageEnglish (US)
Pages (from-to)D211-D215
JournalJournal of Occupational and Environmental Hygiene
Volume12
Issue number9
DOIs
StatePublished - Sep 2 2015

Fingerprint

Ebolavirus
Decontamination
Gases
Suspensions
Mycobacterium smegmatis
Bacillus anthracis
Enterococcus faecalis
Ebola Hemorrhagic Fever
Escherichia coli
Disinfectants
Body Fluids
Occupational Exposure
Humidity
chlorine dioxide
Spores
Industry
Stem Cells
Bacteria
Delivery of Health Care
Safety

Keywords

  • blood
  • chlorine dioxide
  • Ebola
  • enterococcus
  • escherichia
  • mycobacterium

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

Cite this

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title = "Surrogate Testing Suggests That Chlorine Dioxide Gas Exposure Would Not Inactivate Ebola Virus Contained in Environmental Blood Contamination",
abstract = "The ability to decontaminate a room potentially containing the Ebola virus is important to healthcare facilities in the United States. The Ebola virus remains viable in body fluids, a room that has housed a patient with Ebola virus disease must have all surfaces manually wiped with an approved disinfectant, which increases occupational exposure risk. This study evaluated the efficacy of gaseous chlorine dioxide inactivation of bacterial organisms in blood as the Ebola virus surrogates and as the organisms used by the Nebraska Biocontainment Unit to provide the margin of safety for decontamination. Bacillus anthracis, Escherichia coli, Enterococcus faecalis, and Mycobacterium smegmatis blood suspensions that were exposed to ClO2 gas concentrations and exposure limits. The log reduction in Colony Forming Units (CFU) was determined for each bacterial blood suspension. Exposure parameters approximating industry practices for ClO2 environmental decontamination (360 ppm concentration to 780 ppm-hr exposure, 65{\%} relative humidity) as well as parameters exceeding current practice (1116 ppm concentration to 1400 ppm-hr exposure; 1342 ppm concentration to 1487 ppm-hr exposure) were evaluated. Complete inactivation was not achieved for any of the bacterial blood suspensions tested. Reductions were observed in concentrations of B. anthracis spores (1.3-3.76 log) and E. faecalis vegetative cells (1.3 log) whereas significant reductions in vegetative cell concentrations for E. coli and M. smegmatis blood suspensions were not achieved. Our results showed that bacteria in the presence of blood were not inactivated using gaseous ClO2 decontamination. ClO2 decontamination alone should not be used for the Ebola virus, but decontamination processes should first include manual wiping of potentially contaminated blood; especially for microorganisms as infectious as the Ebola virus.",
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