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- W4384704763 abstract "Abstract Background The location of Plasmodium falciparum within the body is determined by the life cycle of the parasite; young rings are in the peripheral blood, whereas mature parasites are sequestered in deep tissues. We can calculate a “ring ratio,” the proportion of parasites in the periphery to the total number of parasites in the body. Artesunate acts on all parasite life stages, whereas quinine is effective only on sequestered parasites. Children with cerebral malaria (CM) treated with artesunate clear parasites faster than those treated with quinine. In this study, we established the relationship between ring ratio and parasite clearance rate and used the ring ratio to determine if the benefit derived from artesunate treatment could be attributed to its broader effect on life cycle stages. Methods Ring ratios were calculated for 400 hospitalized children with CM in Blantyre, Malawi between 2010 and 2019 (quinine: 2010–2013, artesunate: 2014–2019). Results In both treatment groups, parasite clearance rates were positively associated with the ring ratios, with a stronger association in the artesunate era than the quinine era. In the quinine era, an increase of 1-unit log10 difference between parasitemia and plasma P falciparum histidine-rich protein 2 (a proxy for ring ratio) resulted in a 0.27-unit increase in the parasite clearance rate, whereas in the artesunate era an equal increase resulted in a 0.41-unit increase (P = .04 for the difference). Conclusions This analysis provides in vivo evidence supporting the hypothesis that more rapid parasite clearance rates in artesunate recipients are due to its superiority over quinine in killing ring-stage parasites." @default.
- W4384704763 created "2023-07-20" @default.
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- W4384704763 date "2023-07-01" @default.
- W4384704763 modified "2023-09-30" @default.
- W4384704763 title "Differential Effects of Antimalarial Drugs on Parasite Clearance Rates Are Reflected by <i>Plasmodium falciparum</i> Ring Ratio" @default.
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- W4384704763 doi "https://doi.org/10.1093/ofid/ofad380" @default.
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