Predicting the Next Surge: Using Zika–Chikungunya Clusters to Guide Intervention
Zika and chikungunya outbreaks in Brazil move together, not separately. Space-time analysis reveals overlapping clusters driven by shared Aedes aegypti dynamics, summer heat, and regional climate conditions. When ecological risk rises, multiple arboviruses surge simultaneously — reinforcing the need for surveillance systems that anticipate co-circulating threats, not isolated outbreaks.