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. 2012 Sep 5;87(3):538–547. doi: 10.4269/ajtmh.2012.11-0531

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Figure 1. — Effect of prior infection with dengue virus on expression of tumor necrosis factor alpha (TNF alpha) in persons with IgG titers ≥ 40 against dengue virus when tested by enzyme-linked immunosorbent assay in Havana, Cuba. Mock, peripheral blood mononuclear cells (PBMC) challenged with uninfected C636 supernatant; D1, PBMC challenged with dengue virus 1; D2, PBMC challenged with dengue virus 2; D3, PBMC challenged with dengue virus 3. Panels show different scales according to the range of values observed.