Fig. 1From: The impact of individual-level heterogeneity on estimated infectious disease burden: a simulation studyOutcome trees describing the natural histories of two hypothetical diseases, termed disease model X1: (three health outcomes: acute infection, chronic infection, and death following chronic infection) (upper panel), and disease model X 2: (four health outcomes: acute infection, chronic infection, severe sequela, and death) (lower panel). DW = disability weight; DD = disability duration; TP = transition probabilityBack to article page