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Journal of Virology, October 2004, p. 10230-10237, Vol. 78, No. 19
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.19.10230-10237.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Protective Immunity to Vaccinia Virus Induced by Vaccination with Multiple Recombinant Outer Membrane Proteins of Intracellular and Extracellular Virions

Christiana Fogg,1 Shlomo Lustig,1,{dagger} J. Charles Whitbeck,2 Roselyn J. Eisenberg,2 Gary H. Cohen,2 and Bernard Moss1*

Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland,1 Schools of Dental and Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania2

Received 29 April 2004/ Accepted 24 May 2004

Infectious intracellular and extracellular forms of vaccinia virus have different outer membrane proteins, presenting multiple targets to the immune system. We investigated the immunogenicity of soluble forms of L1, an outer membrane protein of the intracellular mature virus, and of A33 and B5, outer membrane proteins of the extracellular enveloped virus. The recombinant proteins, in 10-µg amounts mixed with a Ribi- or saponin-type adjuvant, were administered subcutaneously to mice. Antibody titers to each protein rose sharply after the first and second boosts, reaching levels that surpassed those induced by percutaneous immunization with live vaccinia virus. Immunoglobulin G1 (IgG1) antibody predominated after the protein immunizations, indicative of a T-helper cell type 2 response, whereas live vaccinia virus induced mainly IgG2a, indicative of a T-helper cell type 1 response. Mice immunized with any one of the recombinant proteins survived an intranasal challenge with 5 times the 50% lethal dose of the pathogenic WR strain of vaccinia virus. Measurements of weight loss indicated that the A33 immunization most effectively prevented disease. The superiority of protein combinations was demonstrated when the challenge virus dose was increased 20-fold. The best protection was obtained with a vaccine made by combining recombinant proteins of the outer membranes of intracellular and extracellular virus. Indeed, mice immunized with A33 plus B5 plus L1 or with A33 plus L1 were better protected than mice immunized with live vaccinia virus. Three immunizations with the three-protein combination were necessary and sufficient for complete protection. These studies suggest the feasibility of a multiprotein smallpox vaccine.


* Corresponding author. Mailing address: 4 Center Dr., MSC 0445, NIH, Bethesda, MD 20892-0445. Phone: (301) 496-9869. Fax: (301) 480-1147. E-mail: bmoss{at}nih.gov.

{dagger} Present address: Department of Infectious Diseases, Israel Institute for Biological Research, Ness-Ziona, Israel.


Journal of Virology, October 2004, p. 10230-10237, Vol. 78, No. 19
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.19.10230-10237.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.




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