Adenovirus-induced immune response in ovine fetuses.
Ovine fetuses were examined for immune responsiveness to ovine adenovirus (strain ORT/111) at 70-80 days of gestation. Nineteen days after experimental infection, all infected fetuses, along with their eventual non-infected twins, had neutralizing serum antibodies to the virus in the titre range of 1 : 32-1 : 128. The antibodies were identified electrophoretically as subclass IgG1 and IgG2. No other Ig-class was involved in the immune response. Infection of the fetuses accounted for antibody production in the maternal organism, too. Immunofluorescence tests detected a periarteriolar, diffuse or focal occurrence of IgG-positive cells in the fetal spleen, and in pulmonary, renal and cotyledon tissue samples. IgM-positive cells were found exclusively in the spleen, always in a low number and in diffuse distribution. No Ig-carrier cells were detected in the liver, thymus and lymph nodes. The blood contained both IgG and IgM-positive cells at a proportion of 6-7 and 1-2%, respectively. Spleen cell cultures stimulated in vitro with ovine adenovirus antigen showed an average 3HTdR incorporation rate of 22%.
D000256:Adenoviridae / Q000276:immunology*; D000818:Animals; D000914:Antibodies, Viral / Q000096:biosynthesis*; D000921:Antibody-Producing Cells / Q000166:cytology*; D005333:Fetus / Q000276:immunology*; D007074:Immunoglobulin G / Q000096:biosynthesis*; D007075:Immunoglobulin M / Q000096:biosynthesis; D008213:Lymphocyte Activation; D009500:Neutralization Tests; D013552:Swine / Q000196:embryology*
D000914:Antibodies, Viral; D007074:Immunoglobulin G; D007075:Immunoglobulin M