The Rat‐Based Neurovirulence Safety Test for the Assessment of Mumps Virus Neurovirulence in Humans: An International Collaborative Study
1Office of Vaccines Research and Review, 2Office of Blood Research and Review, and 3Office of the Director, Center for Biologics Evaluation and Research, Food and Drug Adminstration, Bethesda, Maryland; 4Division of Virology, National Institute for Biological Standards and Control, South Mimms, Potters Bar, Herts, United Kingdom
Because of the highly neurotropic and neurovirulent properties of wild‐type mumps viruses, most national regulatory organizations require neurovirulence testing of virus seeds used in the production of mumps vaccines. Such testing has historically been performed in monkeys; however, some data suggest that testing in monkeys does not necessarily discriminate among the relative neurovirulent risks of mumps virus strains. To address this problem, a collaborative study was initiated by the National Institute for Biological Standards and Control in the United Kingdom and the Food and Drug Administration in the United States, to test a novel rat‐based mumps virus neurovirulence safety test. Results indicate that the assay correctly assesses the neurovirulence potential of mumps viruses in humans and is robust and reproducible.
Received 6 August 2004; accepted 8 October 2004; electronically published 22 February 2005.
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Online publication date: 1-Aug-2009.
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Online publication date: 1-Feb-2009.
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Online publication date: 1-Jan-2009.
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Financial support: National Vaccine Program Office, US Department of Health and Human Services.





