Email updates

Keep up to date with the latest news and content from BMC Infectious Diseases and BioMed Central.

Open Access Research article

Can vaccinia virus be replaced by MVA virus for testing virucidal activity of chemical disinfectants?

Holger F Rabenau1*, Ingrid Rapp2 and Jochen Steinmann3

Author Affiliations

1 Institute of Medical Virology, Hospital of the Johann Wolfgang Goethe University of Frankfurt, Paul-Ehrlich-Str. 40, 60596 Frankfurt am Main, Germany

2 Labor Dr. Merk & Kollegen, Beim Braunland 1, 88416 Ochsenhausen, Germany

3 MikroLab GmbH, Norderoog 2, 28259 Bremen, Germany

For all author emails, please log on.

BMC Infectious Diseases 2010, 10:185  doi:10.1186/1471-2334-10-185

Published: 23 June 2010

Abstract

Background

Vaccinia virus strain Lister Elstree (VACV) is a test virus in the DVV/RKI guidelines as representative of the stable enveloped viruses. Since the potential risk of laboratory-acquired infections with VACV persists and since the adverse effects of vaccination with VACV are described, the replacement of VACV by the modified vaccinia Ankara strain (MVA) was studied by testing the activity of different chemical biocides in three German laboratories.

Methods

The inactivating properties of different chemical biocides (peracetic acid, aldehydes and alcohols) were tested in a quantitative suspension test according to the DVV/RKI guideline. All tests were performed with a protein load of 10% fetal calf serum with both viruses in parallel using different concentrations and contact times. Residual virus was determined by endpoint dilution method.

Results

The chemical biocides exhibited similar virucidal activity against VACV and MVA. In three cases intra-laboratory differences were determined between VACV and MVA - 40% (v/v) ethanol and 30% (v/v) isopropanol are more active against MVA, whereas MVA seems more stable than VACV when testing with 0.05% glutardialdehyde. Test accuracy across the three participating laboratories was high. Remarkably inter-laboratory differences in the reduction factor were only observed in two cases.

Conclusions

Our data provide valuable information for the replacement of VACV by MVA for testing chemical biocides and disinfectants. Because MVA does not replicate in humans this would eliminate the potential risk of inadvertent inoculation with vaccinia virus and disease in non-vaccinated laboratory workers.