Abstract
Advances in genetic engineering in the past decade have accelerated the expression, in plants, of foreign proteins with industrial and pharmaceutical value. Antigens from infectious bacterial or viral diseases have been introduced into plants through plant virus-mediated infection or Agrobacterium tumefaciens-mediated stable transformation methods. Oral immunization with transgenic plant tissues that contain vaccine antigen proteins stimulates both systemic and mucosal immune responses in animals. Plant-based vaccines can provide significant levels of protection against challenge by viral or bacterial pathogens.
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