Effective repeat administration of adenovirus vectors following intranasal or intravenous delivery is hindered by a strong neutralizing antibody response to the vector. Intramuscular administration of adenovirus vectors elicited a neutralizing antibody response that peaked between 14 and 21 days after infection. However, effective repeat intramuscular administration of adenovirus vectors was not hindered by the presence of neutralizing antibodies in the serum. Surprisingly, -galactosidase expression in the skeletal muscle of immunized mice was equivalent to that observed in control
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