Fig. 2.

Scatterplots of post-dose 3 (PD3) titres against heterologous serotypes. Each point represents an observation and the colour of the point denotes the baseline immunological status against DENV. “DENV−” denotes DENV seronegative (i.e. baseline PRNT50 titres < 10 for all DENV serotypes), “monotypic” denotes subjects with PRNT50 titres ≥ 10 for one DENV serotype only or more than one DENV serotype with a titre ≥ 80 to only one DENV serotype, “multitypic” denotes subjects with PRNT50 titres ≥ 10 for at least two DENV serotypes without titre ≥ 80 to only one DENV serotype. Undetectable titres (below the detection threshold of 10) are assigned a titre value of 5. Titres are shown on a log 10 scale.