Fig. 2: Transmission from surveillance of human cases.

Mean (solid line) and 95%CI (shaded area) estimates of the net reproduction number Rt, based on the time series of notified cases by date of symptom onset across the six outbreaks of DENV (top) and CHIKV (bottom) occurred in Italy between 2006 and 2023. Gray bars represent the weekly number of notified cases by date of symptom onset.