Development and use of a synthetic peptide for the detection of specific antibodies against Plasmodium falciparum
Evaluación y uso de un péptido sintético para la detección de anticuerpos específicos contra Plasmodium falciparum
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Introduction. Malaria continues being one of the diseases causing the greatest morbi-mortality around the world. For that reason, effective diagnostic tools must thus be developed which can be used in strategies for controlling the disease. Objectives. To standardise enzyme-linked immunosorbent assay (ELISA) conditions for detecting Plasmodium falciparum specific IgG in sera from patients diagnosed by thick smear as suffering non-complicated malaria caused by P. falciparum. A protein extract obtained from P. falciparum culture or a synthetic peptide derived from glutamate rich protein (GLURP) merozoite surface protein would be used as antigen. Materials and Methods. 22 serum samples from patients diagnosed as suffering from P. falciparum malaria, 11 serum samples from patients diagnosed as suffering from P. vivax and 44 from healthy donors, diagnosed by using the thick smear tecnique were used for standarising the technique. Serum samples were tested against parasite protein extract and GLURP-derived IMT 94 synthetic peptide for standardisign optimum dilutions and concentrations for each component in the system. 251 serum samples from patients diagnosed as suffering from P. falciparum malaria and 44 from healthy donors diagnosed by using the thick smear tecnique were used to validate the technique. Results. The technique led to significant differences being observed in antigens (protein extract and synthetic peptides) recognising serum from positive and negative patients and controls. Conclusions. The methodology used led to identifying specific immune response against P. falciparum.
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