Forskning ved Københavns Universitet - Københavns Universitet


Antibody responses to antigenic targets of recent exposure are associated with low-density parasitemia in controlled human Plasmodium falciparum infections

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  • Lotus L. van den Hoogen
  • Jona Walk
  • Tate Oulton
  • Isaie J. Reuling
  • Linda Reiling
  • James G. Beeson
  • Ross L. Coppel
  • Singh, Susheel
  • Simon J. Draper
  • Teun Bousema
  • Chris Drakeley
  • Robert Sauerwein
  • Kevin K. A. Tetteh
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/μl in the majority of participants (50/54), while the remaining four participants had peak densities between 100 and 200 parasites/μl. 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 ρ = 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.
TidsskriftFrontiers in Microbiology
Antal sider11
StatusUdgivet - 2019

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