Naturally Acquired Antibody Responses to the C-Terminal Region of Merozoite Surface Protein 1 ofPlasmodium vivaxin Korea

Open Access

1 January 2001

journal article
Published by American Society for Microbiology in Clinical and Diagnostic Laboratory Immunology

Vol. 8 (1) , 14-20
https://doi.org/10.1128/cdli.8.1.14-20.2001

Abstract

We expressed a protein inSaccharomyces cerevisiaein order to evaluate the humoral immune responses to the C-terminal region of the merozoite surface protein 1 ofPlasmodium vivax. This protein (Pv200₁₈) had a molecular mass of 18 kDa and was reactive with the sera of individuals with patent vivax malaria on immunoblotting analysis. The levels of immunoglobulin M (IgM) and IgG antibodies against Pv200₁₈were measured in 421 patients with vivax malaria (patient group), 528 healthy individuals from areas of nonendemicity (control group 1), and 470 healthy individuals from areas of endemicity (control group 2), using the indirect enzyme-linked immunosorbent assay (ELISA) method. To study the longevity of the antibodies, 20 subjects from the patient group were also tested for the antibody levels once a month for 1 year. When the cutoff values for seropositivity were determined as the mean + 3 × standard deviation of the antibody levels in control group 1, both IgG and IgM antibody levels were negative in 98.5% (465 of 472) of control group 2. The IgG and IgM antibodies were positive in 88.1% (371 of 421) and 94.5% (398 of 421) of the patient group, respectively. The IgM antibody became negative 2 to 4 months after the onset of symptoms, whereas the IgG antibody usually remained positive for more than 5 months. In conclusion, indirect ELISA using Pv200₁₈expressed inS. cerevisiaemay be a useful diagnostic method for vivax malaria.

Keywords

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