Abstract
Dengue is a disease caused by an arbovirus transmitted by mosquito vectors of the Aedes genus, primarily Aedes aegypti and Aedes albopictus, which are widely distributed across Southeast Asia. The region’s climatic conditions favor their proliferation, while increasing urbanization provides abundant breeding sites and opportunities for human-mosquito contact. In the absence of an effective vaccine, monitoring and controlling mosquito populations remain essential strategies for combating the disease, alongside tracking the dynamics of local and regional epidemics. This requires regular monitoring of two key factors: meteorological parameters, which influence the growth and decline of vector populations, and human mobility at local, regional and transnational scales, which shape the spatio-temporal dynamics of dengue transmission. Dengue is therefore a complex pathogenic system, with a geography influenced by both local and transnational factors, requiring multi-scale intervention strategies. This chapter aims to present dengue epidemic surveillance systems in four countries (Thailand, Laos, Cambodia and Vietnam) and to outline the requirements for establishing a transnational surveillance system.