Restoring Ecosystems to Stop the Threat Of (Re-)Emerging Infectious Diseases: There is a growing body of evidence that landscape degradation is linked to zoonotic spillover risk. Large scale restoration is increasingly being touted as an effective solution for mitigating against a range of anthropogenic impacts and is also hypothesised to protect against zoonotic disease spillover. However, little is known about the mechanisms with which restoration may provide this protection. It is commonly assumed that restoration mirrors in reverse the processes that occur during degradation; however, it is likely that this relationship is in fact asymmetric. Rarely can restored landscapes be returned to a state similar to that of pristine ecosystems, and often restored landscapes need to fulfil a range of environmental and socioeconomic requirements that inherently prevent them from doing so. Additionally, the spatiotemporal scale necessary to effect positive change is context dependent, and the type of restoration necessary to protect against zoonotic spillover is currently unknown. Ecosystem restoration can vary widely in type, scale and context and can also change how humans interact with their environment, which may have unexpected consequences for zoonotic disease spillover. Given the complexity of these interactions and their effect on disease, it is vital that we understand how restoration specifically might impact wildlife disease and emergent spillover risk.

Epidemics and pandemics - most of them caused by zoonotic and vector-borne emerging diseases - are globally threatening our health and welfare at an alarming pace. Prevention of future disease outbreaks will be pivotal to secure human welfare and demands transformative change. "Biodiversity-is-good-for-our-health" has become a new paradigm in disease risk mitigation. Consequently, nature restoration targeting biodiversity recovery - isolated or in combination with public health interventions - has been identified as a major disease risk mitigation tool. While there are thousands of ongoing and planned nature restoration projects globally, we lack knowledge a) if such restorations indeed interrupt the infect-shed-spill-spread cascade and mitigate disease risk, b) or if they rather amplify the risk and c) on success factors characterizing restorations that mitigate disease risk. BEPREP will fill this lack in knowledge and provide practical guidance. In spatially and temporally replicated field studies and experiments in case studies in Europe and the tropics, we will study a)-c) and reveal the causal mechanisms of infection dynamics and of drivers along the infect-shed-spill-spread cascade. BEPREP's participatory and transsectorial approach by actively involving indigenous and local communities will enable the identification of success factors of best practice restorations and interventions, incl. nature-based solutions, to guide future biodiversity recovery measures that promote healthy ecosystems. These success factors will contribute to a) interrupt the infect-shed-spill-spread cascade and b) ultimately prevent disease outbreaks. The results of BEPREP help to create a European society prepared and responsive to disease risk. BEPREP will hence accelerate the ecological transition required to meet EU's Biodiversity Strategy for 2030 as a core part of EU's Green Deal and support a green recovery following the COVID-19 pandemic.