Standard method for deposition of dry, aerosolized, silica-coated Bacillus spores onto inanimate surfaces.

Abstract:

AIMS:To evaluate a standard aerosolization method for uniformly depositing threat-representative spores onto surfaces. METHODS AND RESULTS:Lyophilized Bacillus anthracis ΔSterne spores, coated in silica, were aerosolized into a containment chamber and deposited onto nine surface types by two independent laboratories. Laboratory A produced a mean loading concentration of 1·78 × 10(5) CFU cm(-2) ; coefficient of variation (CV) was <40% for 96% of samples. Laboratory B produced a mean loading concentration of 7·82 × 10(6) CFU cm(-2) ; 68% of samples demonstrated CV <40%. CONCLUSIONS:This method has been shown to meet the goal of loading threat-representative spores onto surfaces with low variability at concentrations relevant to the Department of Defense. SIGNIFICANCE AND IMPACT OF THE STUDY:As demonstrated in 2001, a biological attack using anthrax disseminated as a dry powder is a credible threat. This method will provide a means to load spores onto surfaces that mimic a 'real-world' scenario of an aerosolized anthrax attack. The method has utility for evaluating sporicidal technologies and for nondecontamination studies, for example fate and transport or reaerosolization.

journal_name

J Appl Microbiol

authors

Harnish D,Heimbuch BK,McDonald M,Kinney K,Dion M,Stote R,Rastogi V,Smith L,Wallace L,Lumley A,Schreuder-Gibson H,Wander JD

doi

10.1111/jam.12509

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

40-9

issue

1

eissn

1364-5072

issn

1365-2672

journal_volume

117

pub_type

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