Fig. 3
Anti-malarial seroconversion curves for participants in Chabahar city and surrounding villages, southeastern Iran. A reversible catalytic model was fitted to age-adjusted seropositivity data using maximum likelihood to create seroconversion curves. Solid lines represent the fitted probability for being seropositive, dotted lines represent the 95 % confidence interval for these fits, and triangles represent the observed proportion of seropositives per age decile. Seroconversion rates (SCR; λ) are presented on the graph. If the best model to fit the age-adjusted seropositivity data was one with a change point in transmission (see “Methods” section; Table 2), both SCRs are presented on the graph. The P. falciparum SRRs for the city and the village settings were 0.057 year−1 (0.034–0.094) and 0.010 year−1 (0.002–0.062), while for P. vivax these were 0.145 year−1 (0.049–0.423) and 0.048 year−1 (0.022–0.103)