Evolving trends in hepatitis A epidemiology: Shifting patterns, emerging risks, and future strategies

Hepatitis A, a vaccine-preventable liver infection caused by the hepatitis A virus, is undergoing significant epidemiological shifts worldwide. Traditionally considered a disease of childhood in endemic regions, improved sanitation, economic development, and widespread vaccination have led to a decline in incidence, particularly in developed nations. However, this decline has resulted in a growing population of susceptible adults, increasing the risk of severe outbreaks. Additionally, changes in travel patterns, urbanization, and socioeconomic disparities have altered disease distribution, leading to sporadic outbreaks in low-endemicity regions and a rising burden in certain high-risk populations. This review explores the evolving epidemiology of hepatitis A, emphasizing the transition from endemic childhood infections to adult susceptibility. We examine the impact of changing risk factors, including shifting demographics, increased international travel, and regional disparities in vaccination coverage. Furthermore, the review highlights the emergence of new viral strains and their potential implications for disease control. Updated vaccination policies, including targeted immunization strategies and their role in preventing outbreaks, are also discussed. Given these dynamic changes, continued surveillance and public health preparedness tailored to evolving risk groups are crucial for sustained hepatitis A control. By synthesizing recent epidemiological data and policy updates, this review provides insights into the future of hepatitis A prevention and control, offering guidance for clinicians, researchers, and public health professionals.