Figure 1. . . . Number and diversity of dengue outbreaks in northern Queensland, Australia. A) Outbreaks of dengue causing epidemic spread in Queensland 1990–2010 showing 5-year moving average. B) Outbreaks shown as individual serotypes. C) Proportion of dengue virus serotypes responsible for the outbreaks shown in A and B. D) Geographic origins of dengue viruses imported into Queensland by viremic travelers. D1–D4, DENV-1–DENV-4; PNG, Papua New Guinea.