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Antibody Responses to Antigenic Targets of Recent Exposure Are Associated With Low-Density Parasitemia in Controlled Human Plasmodium falciparum Infections.


ABSTRACT: The majority of malaria infections in low transmission settings remain undetectable by conventional diagnostics. A powerful model to identify antibody responses that allow accurate detection of recent exposure to low-density infections is controlled human malaria infection (CHMI) studies in which healthy volunteers are infected with the Plasmodium parasite. We aimed to evaluate antibody responses in malaria-naïve volunteers exposed to a single CHMI using a custom-made protein microarray. All participants developed a blood-stage infection with peak parasite densities up to 100 parasites/?l in the majority of participants (50/54), while the remaining four participants had peak densities between 100 and 200 parasites/?l. There was a strong correlation between parasite density and antibody responses associated with the most reactive blood-stage targets 1 month after CHMI (Etramp 5, GLURP-R2, MSP4 and MSP1-19; Spearman's ? = 0.82, p < 0.001). Most volunteers developed antibodies against a potential marker of recent exposure: Etramp 5 (37/45, 82%). Our findings justify validation in endemic populations to define a minimum set of antigens needed to detect exposure to natural low-density infections.

SUBMITTER: van den Hoogen LL 

PROVIDER: S-EPMC6343524 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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Antibody Responses to Antigenic Targets of Recent Exposure Are Associated With Low-Density Parasitemia in Controlled Human <i>Plasmodium falciparum</i> Infections.

van den Hoogen Lotus L LL   Walk Jona J   Oulton Tate T   Reuling Isaie J IJ   Reiling Linda L   Beeson James G JG   Coppel Ross L RL   Singh Susheel K SK   Singh Susheel K SK   Draper Simon J SJ   Bousema Teun T   Drakeley Chris C   Sauerwein Robert R   Tetteh Kevin K A KKA  

Frontiers in microbiology 20190116


The majority of malaria infections in low transmission settings remain undetectable by conventional diagnostics. A powerful model to identify antibody responses that allow accurate detection of recent exposure to low-density infections is controlled human malaria infection (CHMI) studies in which healthy volunteers are infected with the <i>Plasmodium</i> parasite. We aimed to evaluate antibody responses in malaria-naïve volunteers exposed to a single CHMI using a custom-made protein microarray.  ...[more]

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