Fig. 5From: Using cluster analysis to reconstruct dengue exposure patterns from cross-sectional serological studies in SingaporeComparison of the classification obtained using the threshold method to define exposure and the new classification obtained from cluster analysis. Seronegative subjects are characterised by all PRNT50 titres against DENV1-4 < 30; monotypic subjects display a single PRTN50 titre ≥ 30; multitypic subject is are defined as profiles with more than one PRNT50 titre ≥ 30Back to article page