ANTIBODY REACTIVITY TO LINEAR EPITOPES OF PLASMODIUM FALCIPARUM CYTOADHERENCE-LINKED ASEXUAL GENE 9 IN ASYMPTOMATIC CHILDREN AND ADULTS FROM PAPUA NEW GUINEA

KATHARINE R. TRENHOLME Division of Infectious Diseases and Immunology, The Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research, Brisbane, Queensland, Australia; International Health Program, Menzies School of Health Research, Casuarina, Darwin, Northern Territory, Australia; Papua New Guinea Institute of Medical Research, Madang, Papua, New Guinea

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CRAIG S. BOUTLIS Division of Infectious Diseases and Immunology, The Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research, Brisbane, Queensland, Australia; International Health Program, Menzies School of Health Research, Casuarina, Darwin, Northern Territory, Australia; Papua New Guinea Institute of Medical Research, Madang, Papua, New Guinea

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RACHEL KUNS Division of Infectious Diseases and Immunology, The Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research, Brisbane, Queensland, Australia; International Health Program, Menzies School of Health Research, Casuarina, Darwin, Northern Territory, Australia; Papua New Guinea Institute of Medical Research, Madang, Papua, New Guinea

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MOSES LAGOG Division of Infectious Diseases and Immunology, The Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research, Brisbane, Queensland, Australia; International Health Program, Menzies School of Health Research, Casuarina, Darwin, Northern Territory, Australia; Papua New Guinea Institute of Medical Research, Madang, Papua, New Guinea

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MOSES J. BOCKARIE Division of Infectious Diseases and Immunology, The Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research, Brisbane, Queensland, Australia; International Health Program, Menzies School of Health Research, Casuarina, Darwin, Northern Territory, Australia; Papua New Guinea Institute of Medical Research, Madang, Papua, New Guinea

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MICHELLE L. GATTON Division of Infectious Diseases and Immunology, The Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research, Brisbane, Queensland, Australia; International Health Program, Menzies School of Health Research, Casuarina, Darwin, Northern Territory, Australia; Papua New Guinea Institute of Medical Research, Madang, Papua, New Guinea

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DAVID J. KEMP Division of Infectious Diseases and Immunology, The Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research, Brisbane, Queensland, Australia; International Health Program, Menzies School of Health Research, Casuarina, Darwin, Northern Territory, Australia; Papua New Guinea Institute of Medical Research, Madang, Papua, New Guinea

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MICHAEL F. GOOD Division of Infectious Diseases and Immunology, The Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research, Brisbane, Queensland, Australia; International Health Program, Menzies School of Health Research, Casuarina, Darwin, Northern Territory, Australia; Papua New Guinea Institute of Medical Research, Madang, Papua, New Guinea

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NICHOLAS M. ANSTEY Division of Infectious Diseases and Immunology, The Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research, Brisbane, Queensland, Australia; International Health Program, Menzies School of Health Research, Casuarina, Darwin, Northern Territory, Australia; Papua New Guinea Institute of Medical Research, Madang, Papua, New Guinea

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DONALD L. GARDINER Division of Infectious Diseases and Immunology, The Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research, Brisbane, Queensland, Australia; International Health Program, Menzies School of Health Research, Casuarina, Darwin, Northern Territory, Australia; Papua New Guinea Institute of Medical Research, Madang, Papua, New Guinea

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The cytoadherence-linked asexual gene 9 (clag 9) of Plasmodium falciparum has been implicated in the cytoadherence of infected erythrocytes. To determine the immunogenicity of the clag 9 gene product (CLAG 9 protein) in humans, we measured antibody responses to 11 synthetic CLAG 9 peptides in a group of 177 asymptomatic children and adults subject to intense malaria exposure in Madang, Papua New Guinea. The CLAG 9 peptides were immunogenic in adults and children. Antibody responses to peptides 4 and 10 were high across all age groups and detectable in a majority of children less than five years of age. While CLAG 9 peptides are immunogenic in humans, longitudinal studies will be required to determine the longevity of antibody responses to CLAG 9 and their role in protection from disease.

Author Notes

Reprint requests: Katharine R. Trenholme, Queensland Institute of Medical Research, 300 Herston Road, Queensland, Australia, 4006, E-mail: kathT@qimr.edu.au.
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