Human Immunity Against Emerging and Re-emerging Diseases: Biological Foundations, Societal Challenges, and Future Strategie

• Thomas Evan

  Author

Emerging and re-emerging infectious diseases pose one of the greatest threats to global health in the 21st century. Rapid globalization, environmental change, urbanization, and technological development have accelerated the emergence and spread of novel pathogens, challenging the capacity of human immune systems and public health infrastructures. This paper examines human immunity against new and emerging diseases from an integrated perspective, encompassing biological immune mechanisms, evolutionary adaptation, population-level immunity, and societal interventions. By reviewing the innate and adaptive immune responses to novel pathogens, the role of immunological memory, genetic diversity, and immune evasion strategies of pathogens, this study highlights both the strengths and limitations of human immunity. The paper further explores how vaccines, public health systems, and global cooperation extend natural immunity to confront emerging disease threats. It concludes that while human immunity is inherently adaptive, its effectiveness against emerging diseases depends on the integration of biological resilience with scientific innovation and systemic preparedness.

• JHSCT000007.pdf