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Specific IgG levels in immunized rhesus macaques. Serum samples obtained over a 26-week period were tested at a 1:5,000 dilution in a PV66Δglyc43–487 IgG ELISA. Time points for immunization are indicated by solid arrows, and the day of infection with the P. cynomolgi M strain is indicated by the outline arrow. OD, optical density.
