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J Clin Microbiol. 1993 March; 31(3): 636-641

Possible role of specific immunoglobulin M antibodies to Plasmodium falciparum antigens in immunoprotection of humans living in a hyperendemic area, Burkina Faso.

C Boudin, B Chumpitazi, M Dziegiel, F Peyron, S Picot, B Hogh and P Ambroise-Thomas

Laboratoire de Parasitologie-Mycologie Médicale et Moléculaire (DP3M), Faculté de Médecine, ERS 15 Centre National de la Recherche Scientifique, La Tronche, France.

ABSTRACT

Two seroepidemiological studies were performed in an area of Burkina Faso hyperendemic for malaria to estimate the protective role of immunoglobulin M (IgM) antibodies. Six cross-sectional surveys were carried out on children (ages, < 16 years) in the village of Karankasso. The evolution of antibodies to crude extracts of Plasmodium falciparum (IgG or IgM antisomatic and IgG antiexoantigens) were tested by IFI or enzyme-linked immunosorbent assay and were followed up according to the fluctuations of the parasite densities. Specific IgG antibodies had the same evolution as parasite densities. By contrast, specific IgM antibodies increased when IgG and parasite densities began to decrease (despite a high inoculation rate). A longitudinal survey of 77 children and adults was conducted in another village (Dafinso). In that study, clinical follow-up of the selected individuals allowed us to define three groups in the population. Children in group 1 were considered nonimmune (children with one or more malaria attacks). Group 2 was composed of semiimmune children who did not present with any malarial attack during the survey but who had high levels of parasitemia during the transmission period. Group 3 was composed of immunoprotected adults. Specific IgM and IgG antibodies to crude extracts or a recombinant antigen (glutamate-rich protein) of P. falciparum were tested. Specific IgM antibodies were lower in group 1 (nonimmune) than in groups 2 (semiimmune) and 3 (immunoprotected). Furthermore, there was a negative correlation between parasite densities and the levels of specific IgM antibodies. We discuss the possible role of IgM antibodies in the acquisition of immunity to malaria.

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J Clin Microbiol. 1993 March; 31(3): 636-641

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