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Comparison of serum antibody responses following vaccination of mice with inactivated H9N2 vaccines. Twenty mice per group were vaccinated i.m. with 10 μg of purified formalin-inactivated H9N2 virus vaccine alone, vaccine with alum, or alum alone. Three months later, serum from 10 mice per group were collected and anti-HK/1073 HA IgG, IgA, and IgM antibodies were detected by ELISA. Antibody responses are expressed as reciprocal endpoint titers + standard deviations (SD).
