Fig. 1 Induction of IgM and IgG following controlled human P

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Presentation transcript:

Fig. 1 Induction of IgM and IgG following controlled human P Fig. 1 Induction of IgM and IgG following controlled human P. falciparum infection. Induction of IgM and IgG following controlled human P. falciparum infection. (A) Malaria-naïve healthy individuals underwent inoculation with 1800 or 2800 viable P. falciparum 3D7-parasitized RBCs, and peripheral parasitemia was measured by qPCR. Participants were treated with anti-malarial drugs at day 7 or 8 of infection. Blood samples from 60 volunteers (from 10 independent cohorts) were collected before infection (day 0), at peak infection (day 7 or 8), and 14 or 15 and 28 to 36 days after inoculation; in analysis, these time points are grouped as days 0, 7, 14, and 30. Data are representative of 10 individuals from four cohorts. (B) IgM and IgG levels were measured against MSP2, AMA1, and EBA175 (RII) at days 0, 7, 14, and 30 following controlled human P. falciparum infection in malaria-naïve adults (n = 40). Antibody responses are expressed as optical density (OD) after background subtraction of no-serum wells. Positivity threshold was calculated as means + 3SDs of responses at day 0 (dotted line). P values are Wilcoxon matched-pairs signed-rank test. (C) IgM and IgG responses to several merozoite antigens were measured at day 30 following infection in CHMI participants (n = 20). Prevalence of antibody responses was considered as a positive response if antibody levels were greater than means + 3SDs of responses at day 0. Data are proportion positive, and error bars are upper 95% confidence interval calculated by the Wald method. P value is calculated by Fisher’s exact test. (D) Magnitude of responses relative to day 0 was assessed as arbitrary units (AU = OD day 30/means + 3SDs of responses at day 0). P values are Wilcoxon matched-pairs signed-rank test. (E) Affinity of IgM and IgG to MSP2 was assessed by the dissociation of antibodies using increasing concentrations of ammonium thiocynate. Data are means ± SEM of eight individuals tested in two assays in duplicate, expressed as the percentage of OD in PBS. P values indicate Sidak’s multiple comparison test of IgM verses IgG from two-way analysis of variance (ANOVA), taking into account repeat measures for each individual (*P < 0.05 and **P < 0.01). M. J. Boyle et al. Sci Adv 2019;5:eaax4489 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).