Dengue virus transmission in Italy: historical trends up to 2023 and a data repository into the future.

Dengue virus circulation is on the rise globally, with increased epidemic activity in previously unaffected countries, including within Europe. In 2023, global dengue activity peaked, and Italy reported the highest number of dengue cases and local chains of transmission to date. By curating several sources of information, we introduce a novel data repository focused on dengue reporting in Italy. We integrate data from such a repository with other geographic, genomic and climatic spatiotemporal data to present an overview of transmission patterns of the past eight years related to circulating viral lineages, geographic distribution, hotspots of reporting, and the theoretical contribution of local climate. The novel data repository can contribute to a better understanding of an evolving epidemiological scenario in Italy, with the potential to inform reassessment and planning of adequate national and European public health strategies to manage the emergence of the dengue virus.