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Neonatal C3H/He mice were oronasally inoculated with similar doses of four genotypes of minute virus of mice (MVM). MVMp, a fibroblast-specific variant, caused an asymptomatic infection. MVM(1035), a chimera which had the allotropic determinant of virulent MVMi inserted onto an MVMp background, caused a lethal infection and renal papillary infarcts, the hallmark of MVMi infection. MVMi(NS2-1990), the virulent lymphocyte-specific variant mutated to eliminate NS2 synthesis, was infectious but caused an asymptomatic infection. Sequential virus titration, histology, in situ hybridization with a full-length MVMi genomic probe, and immunohistochemistry for viral capsid antigen were used to compare the pathogenesis of infection with the four MVM genotypes. Infectious virus was recovered from multiple organs of mice infected with MVMi, MVMp, and MVM(1035) but not from mice infected with MVMi(NS2-1990). MVMp titers were lower than MVMi titers in all organs except the intestine. MVM(1035) titers were higher than MVMi titers in all organs except the blood. MVMp was localized to connective tissue elements of the intestine, to cells in mesenteric lymph nodes, and rarely to cells in other organs. MVM(1035) was localized to multiple organs and shared the same target cells, endothelium, lymphoid cells, and hematopoietic cells, as MVMi. MVM(1035) also replicated in external germinal cells of the cerebellum and smooth muscle cells of the stomach and colon, which were not targets of MVMi or MVMp infection. MVMi(NS2-1990) replicated to a limited degree in some MVMi target organs.

journal of virology

The pathogenesis of infection with minute virus of mice depends on expression of the small nonstructural protein NS2 and on the genotype of the allotropic determinants VP1 and VP2