Abstract
Studies of the immunologic responses following administration of a live, enteric-coated adenovirus (ADV) type 21 vaccine showed that nine of ten vaccinees and none of five controls developed neutralizing antibody. Antibody activity of serum and secretory immunoglobulins was assayed by using a 14C-labeled ADV-21 antigen in a radioimmunodiffusion system. Increases in immunoglobulin M, A and G (IgM, IgA, IgG) activity were detected in sera from vaccinees but not in those from controls. IgA copro antibody activity was also shown in vaccinees but not in controls. Nasal secretions showed no detectable IgA antibody responses by this method. These studies show marked differences in serum and local IgA antibody activity in induced enteric ADV infection compared to previously reported responses after natural infection. The protective role of secretory IgA in adenovirus infections is obscure. However, absence of nasal IgA responses may indicate that protection against disease with enteric ADV vaccines depends primarily upon humoral antibody.
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