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• W4294051689 abstract "Abstract Background To further understand the role of NS1 specific antibodies (Abs) in disease pathogenesis, we compared neutralizing antibody levels (Nabs), NS1-Ab levels, IgG antibody sub-class profiles and NS1 specific memory B cell responses (Bmems) in individuals, with varying severity of past dengue. Methods Nabs (Neut50 titres) were assessed using Foci Reduction Neutralization Test (FRNT) and in-house ELISAs were used to assess NS1-Abs and NS1-Ab subclasses for all four DENV serotypes in individuals with past DF (n=22), those with past DHF (n=14) and seronegative (SN) individuals (n=7). B cell ELISpot assays were used to assess NS1-specific Bmem responses. Results 15/22 (68.18%) individuals with past DF and 9/14 (64.29%) individuals with past DHF had heterotypic infections. Neut50 titres were found to be significantly higher for DENV1 than DENV2 (p=0.0006) and DENV4 (p= 0.0127), in those with past DHF, whereas there was no significant difference in titres was seen for different DENV serotypes in those with past DF. Overall NS1-Ab to all serotypes and NS1-specific IgG1 responses for DENV1, 2 and 4 serotypes were significantly higher in those with past DHF than individuals with past DF. Those with past DHF also had higher IgG1 than IgG3 for DENV1 and DENV3, whereas no differences were seen in those with past DF. Over 50% of those with past DF or DHF had NS1-specific Bmem responses to >2 DENV serotypes. There was no difference in the frequency of Bmem responses to any of the DENV serotypes between individuals with past DF and DHF. Although the frequency of Bmem responses to DENV1 corelated with DENV1 specific NS1-Abs levels (Spearman r=0.35, p=0.02), there was no correlation with other DENV serotypes. Conclusions We found that those with past DF had broadly cross reactive Nabs, while those with past DHF had higher NS1-Ab responses possibly with a different functionality profile than those with past DF. Therefore, it would be important to further evaluate the functionality of NS1-specific antibody and Bmem responses to find out the type of antibody repertoire that is associated with protection against severe disease." @default.
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• W4294051689 date "2022-09-01" @default.
• W4294051689 modified "2023-09-30" @default.
• W4294051689 title "Antibody and memory B cell responses to the dengue virus NS1 antigen in individuals with varying severity of past infection" @default.
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• W4294051689 doi "https://doi.org/10.1101/2022.08.30.22279380" @default.
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