Zoonotic Spillover

Zoonotic Spillover refers to the transmission event where a pathogen originating in an animal reservoir infects humans, initiating infection in a new host species. Spillover can occur through direct contact with animals, exposure to contaminated environments, vector-borne transmission, or intermediate host species that facilitate adaptation. Many emerging infectious diseases originate through zoonotic spillover, with outcomes ranging from isolated cases to widespread outbreaks and pandemics depending on the pathogen's ability to sustain human-to-human transmission.

The biopharmaceutical industry addresses spillover risks through surveillance-supported vaccine development, antiviral research, and rapid response platform technologies. Monitoring animal reservoirs and identifying high-risk pathogens enables earlier intervention strategies and supports preparedness planning. Spillover events drive urgent need for diagnostics, therapeutics, and vaccines, as demonstrated by outbreaks of Ebola, SARS, and COVID-19. Research focuses on understanding host range determinants, viral evolution, and immune evasion mechanisms that enable cross-species transmission. As global health priorities increasingly emphasise One Health frameworks integrating human, animal, and environmental health, zoonotic spillover remains a critical concept guiding prevention strategies and pharmaceutical readiness for emerging infectious threats requiring coordinated global response.