Abstract
Susceptible Aotus monkeys were immunized with Escherichia coli-derived fusion proteins containing partial sequences of the proteins MSAI, SERP, HRPII and with a group of three recombinant antigens isolated by screening with an antiserum raised against the protective 41 kDa protein band. HRPII, the combination of the fusion proteins of the 41 kDa group and a mixture of two sequences of SERP conferred significant protection against a challenge infection with Plasmodium falciparum blood stages. Based on the protective capacity of these recombinant antigens we have expressed two hybrid proteins (MS2/SERP/HRPII and SERP/MSAI/HRPII) in E. coli containing selected partial sequences. In two independent immunization trials it was shown that immunization of Aotus monkeys with either of the two hybrid proteins can protect the animals from an experimental P. falciparum infection.
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