Mean FRNT₅₀ values for heterotypic primary sera.

<p>Each serum sample is identified above the graph. Serum 001(<a href="http://www.plosntds.org/article/info:doi/10.1371/journal.pntd.0001486#pntd-0001486-g005" target="_blank">Figure 5A</a>) is from a primary DENV-2 infection in; Serum 006 (<a href="http://www.plosntds.org/article/info:doi/10.1371/journal.pntd.0001486#pntd-0001486-g005" target="_blank">Figure 5B</a>) is from a primary DENV-1 infection; Serum 102 (<a href="http://www.plosntds.org/article/info:doi/10.1371/journal.pntd.0001486#pntd-0001486-g005" target="_blank">Figure 5C</a>) is from a primary DENV-4 infection. Serum histories are summarized in <a href="http://www.plosntds.org/article/info:doi/10.1371/journal.pntd.0001486#pntd-0001486-t002" target="_blank">Table 2</a> and <a href="http://www.plosntds.org/article/info:doi/10.1371/journal.pntd.0001486#pntd.0001486.s001" target="_blank">Text S1</a>. Fold-dilution of serum is on the Y-axis and each clone is identified on the X-axis. Columns show GMT FRNT₅₀ values calculated from FRNT done in triplicate.