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  • Title: Immunization of dogs and cats with a DNA vaccine against rabies virus.
    Author: Osorio JE, Tomlinson CC, Frank RS, Haanes EJ, Rushlow K, Haynes JR, Stinchcomb DT.
    Journal: Vaccine; 1999 Mar 05; 17(9-10):1109-16. PubMed ID: 10195621.
    Abstract:
    The applicability of DNA immunization technology for vaccine development in companion animals was investigated by immunizing dogs and cats by the intramuscular (i.m.) and intradermal (i.d.) routes with a plasmid DNA vector encoding the rabies virus glycoprotein G. In dogs, administration of 100 microg DNA doses by the i.m. route resulted in stronger and more durable rabies virus neutralizing antibody (RVNA) titers than those obtained by i.d. inoculation. In contrast, i.m. vaccination of cats with a similar dose was less effective in terms of mean titer and seroconversion frequency. However, efficacy was improved by increasing the dosage to 300 microg of DNA per immunization. Interestingly, i.d. inoculation of cats appeared to be a superior route of delivery in this species, resulting in higher seroconversion frequency than i.m. administration. In addition, geometric mean RVNA titers in i.d. inoculated cats increased over four-fold during a seven month period following a second and final immunization. These results demonstrate that non-facilitated, naked DNA vaccines can elicit strong, antigen-specific immune responses in dogs and cats, and DNA immunization may be a useful tool for future development of novel vaccines for these species.
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