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. 2010 Oct 27;29(1):17–25. doi: 10.1016/j.vaccine.2010.10.024

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Fig. 2 — Serum vector-specific antibody responses determined by HAI assay using (A) turkey erythrocytes for NDV-specific antibodies or (B) guinea pig erythrocytes for HPIV3-specific antibodies. The individual value for each monkey as well as the group mean (horizontal line) is plotted. The limit of detection (2 log₂) is indicated by a dotted line. Sera with a titer below the detection limit were assigned a titer of 1 log₂ for calculation of the mean.