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DNA vaccination is a novel approach for inducing an immune response. Purified plasmid DNA containing an antigen's coding sequences and the necessary regulatory elements to express them is introduced into the tissue via intramuscular injection or particle bombardment. Once the DNA reaches the tissue, the antigen is expressed in enough quantity to induce a potent and specific immune response and to confer protection against further infections. The effectiveness of DNA vaccines against viruses, parasites, and cancer cells has been demonstrated in numerous animal models. This new approach comes as an aid for the prevention of infectious diseases for which the conventional vaccines have failed. Research on DNA vaccines is providing new insights into some of the basic immunological mechanisms of vaccination such as antigen presentation, the role of effector cells, and immunoregulatory factors. In addition, DNA vaccines may enable us to manipulate the immune system in situations where the response to agents is inappropriate or ineffective. The study of the potential deleterious effects of DNA vaccines is furthering our knowledge regarding the relationship between bacterial DNA and the immune system, as well as its potential application for the study of neonatal tolerance and autoimmunity.
Gil Mor (Wed,) studied this question.
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