Abstract
BALB/c mice were depleted of B cells by anti-mu treatment to investigate the pathogenesis of respiratory syncytial virus (RSV) infection in the absence of antibody. Termination of RSV replication after primary infection occurred with the same kinetics in anti-mu-treated mice as in phosphate-buffered saline (PBS)-treated controls. Yet, when rechallenged, anti-mu-treated mice were more permissive to RSV replication than PBS-treated controls. Anti-mu-treated mice also experienced greater illness than PBS-treated controls during both primary infection and rechallenge. Passive transfer of RSV-specific immune serum to anti-mu-treated mice before rechallenge reconstituted complete protection from RSV replication and diminished illness. Thus, RSV-specific antibody is not required to terminate RSV replication in primary infection, but without antibody, only partial immunity against rechallenge is induced. While it is unknown whether the mechanism is a direct effect on RSV titer or modulation of the illness-causing cellular immune response, the presence of RSV-specific antibody reduces illness in both primary RSV infection and rechallenge of mice.
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Selected References
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