Influenza A virus H5N1: Histopathology, Mortality, Preventive and Therapeutic Approaches and Future Prospects

Influenza A virus H5N1 remains a significant global health concern due to its high pathogenicity and potential for zoonotic transmission. This review explores the pathological impact of H5N1 infection, emphasizing its severe effects on the lower respiratory tract, including alveolar epithelial apoptosis, diffuse alveolar damage (DAD), and acute respiratory distress syndrome (ARDS). Upon infection, the virus induces a hyperinflammatory response, characterized by excessive cytokine production, leading to multi-organ failure and an alarmingly high human mortality rate of approximately 54%. Key histopathological findings, such as epithelial necrosis, vascular damage, and neurological involvement, underscore the severity of infection. Current treatment options, including neuraminidase inhibitors, remain limited, necessitating novel therapeutic strategies such as monoclonal antibody therapy and immune modulation. Additionally, the emergence of antiviral-resistant strains underscores the importance of continuous disease surveillance and vaccine development. This review highlights the urgent need for global preparedness and further research into H5N1 pathogenesis and countermeasures.