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A phase I/IIa safety, immunogenicity, and efficacy bridging randomized study of a two-dose regimen of liquid and lyophilized formulations of the candidate malaria vaccine RTS,S/AS02A in malaria-naive adults.

Author(s): Kester KE, McKinney DA, Tornieporth N, Ockenhouse CF, Heppner DG Jr, Hall T, Wellde BT, White K, Sun P, Schwenk R, Krzych U, Delchambre M, Voss G, Dubois MC, Gasser RA Jr, Dowler MG, O'Brien M, Wittes J, Wirtz R, Cohen J, Ballou WR, RTS,S Malaria Vaccine Evaluation Group

Affiliation(s): Walter Reed Army Institute of Research, 503 Robert Grant Avenue, Silver Spring, MD 20910, USA. kent.kester@na.amedd.army.mil

Publication date & source: 2007-07-20, Vaccine., 25(29):5359-66. Epub 2007 May 30.

Publication type: Clinical Trial, Phase I; Clinical Trial, Phase II; Comparative Study; Randomized Controlled Trial; Research Support, U.S. Gov't, Non-P.H.S.

We conducted an open-label safety and immunogenicity bridging study that compared liquid and lyophilized formulations of the candidate malaria vaccine RTS,S formulated in AS02A in 34 healthy, malaria-naive adults at WRAIR. Volunteers received two doses of either formulation on a 0, 1-month schedule. Both vaccines were well tolerated and similarly immunogenic. Nineteen of 25 subjects who received the lyophilized formulation and six infectivity controls underwent sporozoite challenge to assess vaccine efficacy. All six controls had parasitemia detectable by thick blood smear by day 13 (mean pre-patent period 12.3 days; range 11-13). In the vaccine group, 8 of 19 vaccinees did not develop malaria and were completely protected (i.e., 42%). Among the 11 vaccinees who did become infected, the mean pre-patent period was delayed (14.4 days; range 13-18). The two formulations of RTS,S were equally safe and immunogenic, and the lyophilized formulation showed similar levels of efficacy against sporozoite challenge to that conferred by the liquid formulation in previous studies.

Page last updated: 2007-10-18

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