Fig. 3.

The proportion of weeks with no dengue reports as a function of population size of the Peruvian provinces classified in coastal (▹), mountain (□), and jungle (○) areas. The proportion of weeks with no dengue reports during the entire dengue time were negatively correlated with population size in jungle areas (Spearman ρ=−0·72, P<0·0001) with <30% of weekly records with zero dengue incidence in jungle areas with a population >500 000 people (dashed line is a linear fit to the jungle data), a pattern not observed in coastal or mountain range areas.