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Virus-specific antibodies in trachea/lung and nasal washes and in sera of mice inoculated with M2KO virus. Samples from each group were obtained 4 weeks postimmunization. Samples were serially diluted, and IgG and IgA in samples from individual mice were detected by use of an enzyme-linked immunosorbent assay. Values are expressed as mean absorbances (n = 4).
