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Temporal anti-H1 antibody and A/PR/8/34-neutralizing antibody responses. Antibody titers are expressed as micrograms of A/PR/8/34-specific IgG per milliliter of serum. A neutralizing antibody titer was defined as that dilution of serum which protected MDCK monolayers from infection with 100 TCID50 of influenza virus A/PR/8/34. Immunizations were at 0, 4, and 8 weeks.
