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Journal of Virology, September 2008, p. 9273-9277, Vol. 82, No. 18
0022-538X/08/$08.00+0 doi:10.1128/JVI.00915-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Departments of Biochemistry,1 Pathology/Comparative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina 271572
Received 2 May 2008/ Accepted 19 June 2008
Matrix (M) protein mutants of vesicular stomatitis virus (VSV), such as rM51R-M virus, are less virulent than wild-type (wt) VSV strains due to their inability to suppress innate immunity. Studies presented here show that when inoculated intranasally into mice, rM51R-M virus was cleared from nasal mucosa by day 2 postinfection and was attenuated for spread to the central nervous system, in contrast to wt VSV, thus accounting for its reduced virulence. However, it stimulated an antibody response similar to that in mice infected with the wt virus, indicating that it has the ability to induce adaptive immunity in vivo without causing disease. These results support the use of M protein mutants of VSV as vaccine vectors.
Published ahead of print on 9 July 2008.
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