DNA-based vaccination constitutes one of the most recent approaches to vaccine development. This technology is in principle one of the most simple and yet versatile methods of inducing both humoral and cellular immune responses, as well as protection against a variety of infectious agents. However, although immune responses have been induced in a number of larger species, most information on the efficacy of DNA immunization has been generated in mice. In this review the information available to date about the use of DNA vaccines in farmed animals, including cattle, pigs and poultry, is presented. The areas that need specific attention in the future to bring this technology to the market are discussed, including the issues concerning delivery, safety, compatibility of plasmids in multivalent vaccines and the potential of using immune stimulants as part of a DNA vaccine.
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