Abstract
Serial serum samples from 27 gnotobiotic dogs infected with R252-canine distemper virus (CDV) were tested for anti-viral IgG, IgM and IgA immunoglobulins using an enzyme-linked immunosorbent assay (ELISA). The results were compared retrospectively to clinicopathological course of disease and to previously reported patterns of complement-fixing and virus neutralizing antibody titers determined in these same sera. Virus-specific IgA was never detected in the sera. High levels of IgG correlated with recovery from disease, whereas the antiviral IgM levels were equivalent in both persistently infected animals and those animals which recovered from disease. The inability to sustain a significant antiviral antibody response in either IgM or IgG classes was characteristic of dogs with fatal encephalitis. The data suggests that IgG is the most important Ig class for recovery from disease.
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