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J Virol, February 1998, p. 1491-1496, Vol. 72, No. 2
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Immunization of Pigs with a Particle-Mediated DNA Vaccine to Influenza A Virus Protects against Challenge with Homologous Virus

Michael D. Macklin,1 Dennis McCabe,1 Martha W. McGregor,2 Veronica Neumann,1 Todd Meyer,1 Robert Callan,2 Virginia S. Hinshaw,2 and William F. Swain1,*

PowderJect Vaccines, Inc.1 and Department of Pathobiological Sciences and Veterinary Sciences, University of Wisconsin---Madison,2 Madison, Wisconsin

Received 7 July 1997/Accepted 11 November 1997

Particle-mediated delivery of a DNA expression vector encoding the hemagglutinin (HA) of an H1N1 influenza virus (A/Swine/Indiana/1726/88) to porcine epidermis elicits a humoral immune response and accelerates the clearance of virus in pigs following a homotypic challenge. Mucosal administration of the HA expression plasmid elicits an immune response that is qualitatively different than that elicited by the epidermal vaccination in terms of inhibition of the initial virus infection. In contrast, delivery of a plasmid encoding an influenza virus nucleoprotein from A/PR/8/34 (H1N1) to the epidermis elicits a strong humoral response but no detectable protection in terms of nasal virus shed. The efficacy of the HA DNA vaccine was compared with that of a commercially available inactivated whole-virus vaccine as well as with the level of immunity afforded by previous infection. The HA DNA and inactivated viral vaccines elicited similar protection in that initial infection was not prevented, but subsequent amplification of the infection is limited, resulting in early clearance of the virus. Convalescent animals which recovered from exposure to virulent swine influenza virus were completely resistant to infection when challenged. The porcine influenza A virus system is a relevant preclinical model for humans in terms of both disease and gene transfer to the epidermis and thus provides a basis for advancing the development of DNA-based vaccines.

* Corresponding author. Mailing address: PowderJect Vaccines, Inc., 585 Science Dr., Suite C, Madison, WI 53711. Phone: (608) 231-3150. Fax: (608) 231-6990. E-mail: will_swain{at}compuserve.com.




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