Measured RNA and antibody titres over time for DENV1-infected subjects.

<p>The left hand axis shows log₁₀ RNA copies/ml of plasma in black. The right hand axis shows IgG titres in red and IgM titres in purple (both on a linear scale). Each box represents the viral and antibody measurements of a different individual. Unfilled marker symbols show measurements below the assay limit of detection for virus and above the upper limit of reliable (linear) quantification for IgG and IgM [<a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1004951#pcbi.1004951.ref013" target="_blank">13</a>]. Subjects classified as primary infections are outlined in green. Patient 15, who shows the lowest RNA titres overall, is outlined in black.