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Duck hepatitis B virus: a model to assess efficacy of disinfectants against hepadnavirus infectivity

Published online by Cambridge University Press:  19 October 2009

S. M. Murray
Affiliation:
Department of Infectious Diseases, University of Sydney, NSW, Australia, 2006
J. S. Freiman
Affiliation:
Department of Infectious Diseases, University of Sydney, NSW, Australia, 2006
K. Vickery*
Affiliation:
Department of Infectious Diseases, University of Sydney, NSW, Australia, 2006
D. Lim
Affiliation:
Department of Infectious Diseases, University of Sydney, NSW, Australia, 2006
Y. E. Cossart
Affiliation:
Department of Infectious Diseases, University of Sydney, NSW, Australia, 2006
R. K. Whiteley
Affiliation:
Department of Infectious Diseases, University of Sydney, NSW, Australia, 2006
*
*K. Vickery, Department of Infections Diseases, University of Sydney, Sydney, NSW 2006, Australia.
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The efficacy of three proprietary glutaraldehyde disinfectants and their component bases was assessed using the duck hepatitis B virus (DHBV) model. Inactivation of infectivity of undiluted serum containing 106·8 ID50/ml DHBV was assessed after a mixture with an equal volume of disinfectant had stood at room temperature for 10 min. A dried spill of infectious serum was simulated using sterile filter paper disks, saturated with serum containing DHBV, dried and then exposed to test disinfectant for 10 min. Residual infectivity, and hence the reduction in virus titre, was determined by inoculation of dilutions of the treated samples into 1-day-old ducklings. A greater than 3 log10 reduction in virus titre could be demonstrated for the disinfectants as well as for some of their component bases. Disinfectant activity varied according to the method of viral presentation but a reduction of exposure time from 10 to 2·5 min did not diminish activity. The experimental protocol permits a comparative and quantitative assessment of the efficacy of both established and new disinfectants.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1991

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