A recombinant porcine adenovirus expressing the classical swine fever virus (CSFV) gp55 gene (rPAdV-gp55) was administered to commercially available outbred pigs via the subcutaneous or oral route and their susceptibility to 'in contact' challenge with classical swine fever determined. Animals vaccinated subcutaneously with a single dose of recombinant vaccine and challenged by 'in contact' exposure were protected from disease, whereas pigs given an equivalent single oral dose did not survive challenge. However, pigs given two oral doses of rPAdV-gp55, 22 days apart, were completely protected from disease. In addition, two doses of rPAdV-gp55 given subcutaneously was shown to boost CSFV neutralising antibody compared with a single dose, but neither a single dose nor two doses given orally induced detectable neutralising antibody responses.
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| http://dx.doi.org/10.1016/j.virusres.2003.08.003 | DOI Listing |
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