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Published in: Malaria Journal 1/2015

Open Access 01-12-2015 | Research

Protection of Malian children from clinical malaria is associated with recognition of multiple antigens

Authors: Modibo Daou, Bourèma Kouriba, Nicolas Ouédraogo, Issa Diarra, Charles Arama, Yamoussa Keita, Sibiri Sissoko, Boucary Ouologuem, Seydou Arama, Teun Bousema, Ogobara K Doumbo, Robert W Sauerwein, Anja Scholzen

Published in: Malaria Journal | Issue 1/2015

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Abstract

Background

Naturally acquired immunity to clinical malaria is thought to be mainly antibody-mediated, but reports on antigen targets are contradictory. Recognition of multiple antigens may be crucial for protection. In this study, the magnitude of antibody responses and their temporal stability was assessed for a panel of malaria antigens in relation to protection against clinical Plasmodium falciparum malaria.

Methods

Malian children aged two to 14 years were enrolled in a longitudinal study and followed up by passive and active case detection for seven months. Plasma was collected at enrolment and at the beginning, in the middle and after the end of the transmission season. Antibody titres to the P. falciparum-antigens apical membrane protein (AMA)-1, merozoite surface protein (MSP)-119, MSP-3, glutamine-rich protein (GLURP-R0) and circumsporozoite antigen (CSP) were assessed by enzyme-linked immunosorbent assay (ELISA) for 99 children with plasma available at all time points. Parasite carriage was determined by microscopy and nested PCR.

Results

Antibody titres to all antigens, except MSP-119, and the number of antigens recognized increased with age. After malaria exposure, antibody titres increased in children that had low titres at baseline, but decreased in those with high baseline responses. No significant differences were found between antibody titers for individual antigens between children remaining symptomatic or asymptomatic after exposure, after adjustment for age. Instead, children remaining asymptomatic following parasite exposure had a broader repertoire of antigen recognition.

Conclusions

The present study provides immune-epidemiological evidence from a limited cohort of Malian children that strong recognition of multiple antigens, rather than antibody titres for individual antigens, is associated with protection from clinical malaria.
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Metadata
Title
Protection of Malian children from clinical malaria is associated with recognition of multiple antigens
Authors
Modibo Daou
Bourèma Kouriba
Nicolas Ouédraogo
Issa Diarra
Charles Arama
Yamoussa Keita
Sibiri Sissoko
Boucary Ouologuem
Seydou Arama
Teun Bousema
Ogobara K Doumbo
Robert W Sauerwein
Anja Scholzen
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Malaria Journal / Issue 1/2015
Electronic ISSN: 1475-2875
DOI
https://doi.org/10.1186/s12936-015-0567-9

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