Targeting Zoonotic Spillover Drivers for Global Pandemic Prevention: A Narrative Review

Zoonoses account for the majority of recognized mammalian viral spillover events, primarily originating from bats, rodents, and primates. Human activities have significantly accelerated these transmissions. This narrative review synthesizes the evolutionary, ecological, pathogen-related, and anthropogenic drivers of viral zoonotic spillover to identify critical leverage points for pandemic prevention. A narrative literature review was conducted. The analysis focused on factors enabling animal pathogens to transform into human pathogens, examining host species, pathogen traits, human-animal interactions, and environmental impacts. Pathogen transformation depends on host traits, contact frequency, and viral characteristics. Anthropogenic drivers-including livestock expansion, the bushmeat trade, wet markets, and the exotic pet industry-significantly elevate spillover risks. Effective pandemic prevention requires targeted interventions at the wildlife-livestock-human interfaces. A holistic, multidisciplinary collaboration between national governments and international organizations is essential to mitigate future risks.