Fig. 3 in Nasal vaccination of six squirrel monkeys (Saimiri sciureus): Improved immunization protocol against Toxoplasma gondii with a nanoparticle-born vaccine

Fig. 3. Humoral immune response analyzed by ELISA on serum for each Saimiri. The results are presented as optical density (OD) before the immunization (T0), and 2 months after the 2nd boost. Serum from one seropositive and three seronegative humans were used as positive and negative controls, respectively. Cut-off was determined at each dilution, as the mean + 2.5xSD of the negative controls.