Abstract
The murine cytomegalovirus (MCMV) glycoprotein B (gB) gene was expressed in an adenovirus replication-deficient vector. This virus, designated Ad-gB, was used to immunize BALB/c and B6 mice by the intranasal (i.n.) route to induce an immune response. Following primary immunization, antibody was detected in serum of 100% of vaccinees, as well as the bronchoalveolar lavage, fecal suspensions and vaginal washings. The viral titer of lung and salivary gland of vaccinees 10 days after intranasal challenge with MCMV at 10 5 or 10 3 plaque forming units (PFU) were significantly reduced compared to controls. Re-exposure of vaccinees to Ad-gB 30 days after primary immunization induced a remarkable boost of serum and mucosal antibody responses and further reduction of MCMV titers in the lung and salivary glands. The ability to induce both a systemic and mucosal immune response to a specific gene product may be important in reducing horizontal transmission of CMV infections across mucosal surfaces and in altering host immunity to CMV.
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