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Vaccine. 2009 Jun 24;27(31):4104-9. doi: 10.1016/j.vaccine.2009.04.077. Epub 2009 May 15.

A Phase 1 study of the blood-stage malaria vaccine candidate AMA1-C1/Alhydrogel with CPG 7909, using two different formulations and dosing intervals.

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Malaria Vaccine Development Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Twinbrook I, MD 20852, USA.


A Phase 1 study was conducted in 24 malaria naïve adults to assess the safety and immunogenicity of the recombinant protein vaccine apical membrane antigen 1-Combination 1 (AMA1-C1)/Alhydrogel with CPG 7909 in two different formulations (phosphate buffer and saline), and given at two different dosing schedules, 0 and 1 month or 0 and 2 months. Both formulations were well tolerated and frequency of local reactions and solicited adverse events was similar among the groups. Peak antibody levels in the groups receiving CPG 7909 in saline were not significantly different than those receiving CPG 7909 in phosphate. Peak antibody levels in the groups vaccinated at a 0,2 month interval were 2.52-fold higher than those vaccinated at a 0,1 month interval (p=0.037, 95% CI 1.03, 4.28). In vitro growth inhibition followed the antibody level: median inhibition was 51% (0,1 month interval) versus 85% (0,2 month interval) in antibody from samples taken 2 weeks post-second vaccination (p=0.056).

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