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• W2118633863 abstract "Aim: Congenital human CMV (HCMV) infection can lead to long-term neurodevelopmental sequelae, including mental retardation and sensorineural hearing loss. Preconception vaccine strategies relevant to the prevention of HCMV-mediated injury to the newborn can be studied in the Guinea pig CMV (GPCMV) model. The objectives of this study were: to assess in Guinea pigs the protective efficacy against congenital infection and disease of a recombinant live, attenuated vaccine with a targeted deletion of the GPCMV homolog of the HCMV pUL83 tegument protein, GP83; and to compare the extent of placental infection in vaccine and control groups using an in situ hybridization assay. Materials & methods: Outbred Hartley Guinea pigs were vaccinated prior to pregnancy with a two-dose series of 5 × 10 4 PFU of vAM409, a GP83 deletion virus. Deletion of the GP83 gene resulted in an attenuated virus, and vAM409-vaccinated animals did not demonstrate evidence of DNAemia following vaccination, although ELISA antibody responses were comparable to those observed in natural infection. After mating, pregnant animals were challenged with salivary gland-adapted GPCMV (1 × 10 6 PFU) in the second trimester, and pregnancy outcomes were compared with controls. Results: Compared with placebo-immunized controls, vaccination resulted in significantly reduced maternal DNAemia following salivary gland challenge, and there was significantly decreased pup mortality in litters born to vaccinated dams (3/29; 10%), compared with control (35/50; 70%; p < 0.001). By in situ hybridization study, recovered placentas in the vAM409 vaccine group demonstrated reduced infection and fewer infectious foci compared with the control group. Conclusion: In summary, preconception immunization with a GP83 deletion vaccine reduced maternal DNAemia and resulted in protection against congenital GPCMV-associated pup mortality compared with unvaccinated controls. Vaccination resulted in reduced placental infection, probably related to the reduction in maternal DNAemia. Although the pp65 homolog in GPCMV, GP83, is a known target of protective T-cell immune responses, it is nevertheless dispensable for effective vaccination against maternal and fetal CMV disease in this model." @default.
• W2118633863 created "2016-06-24" @default.
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• W2118633863 date "2013-12-01" @default.
• W2118633863 modified "2023-10-12" @default.
• W2118633863 title "An attenuated CMV vaccine with a deletion in tegument protein GP83 (pp65 homolog) protects against placental infection and improves pregnancy outcome in a Guinea pig challenge model" @default.
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• W2118633863 doi "https://doi.org/10.2217/fvl.13.107" @default.
• W2118633863 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3900008" @default.
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