Five year safety and immunogenicity of GlaxoSmithKline's candidate malaria vaccine RTS,S/AS02 following administration to semi-immune adult men living in a malaria-endemic region of The Gambia

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Abstract
RTS,S is a pre-erythrocytic malaria vaccine candidate antigen based on the circumsporozoite surface protein of Plasmodium falciparum fused to HBsAg, incorporating a novel Adjuvant System (AS02). The first field efficacy of RTS,S/AS02 against infection was demonstrated in a trial initiated in The Gambia in 1998. This paper presents the five year safety and immunogenicity follow up of the 306 men who were enrolled in the original trial.In the primary study men aged 18 to 45 years were randomized to receive either RTS,S/AS02 or rabies vaccine at 0, 1, 5 months followed by a booster dose at month 19. The subjects were observed for long term safety and immunogenicity continuously until month 58.Of the 153 subjects in each group at enrollment, 80 (52%) subjects in the RTS,S/AS02 group and 83 (54%) subjects in the rabies group returned for the final long-term follow-up visit at month 58. The main reason for non-attendance at month 58 was migration (76% of all drop-outs). Nine subjects in the RTS,S/AS02 group and...

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