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NS1-antibody responses in individuals with past infection. a–o DENV1 NS1-specific IgG antibody responses to DENV-1 NS1 overlapping peptides 1–61 in seronegative individuals (Neg, n = 20), those with past non-severe dengue (NSD, n = 24) and past severe dengue (SD, n = 17). Error bars represent mean and standard deviation. Differences between the groups were compared using the Mann–Whitney U test (two tailed). *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001
