Hepatitis E Virus: Epidemiology, Clinical Aspects, and Its Significance as a Major Pregnancy Risk

HEV is a single-stranded, positive RNA virus. The hepatitis E virus (HEV) is the causing agent of hepatitis, with a high prevalence rate in low-income countries due to poor sanitary conditions. It can exhibit acute, continuous, or extrahepatic consequences in immunocompromised individuals such as those undergoing organ transplantation and having HIV infection. HEV infection is either self limiting (silent), meaning the patient will possibly recover on his own, or symptomatic, causing acute liver injury or fulminant hepatitis and may eventually cause death. It can also cause chronic hepatitis that can progress to cirrhosis or recovery. Pregnancy-related HEV infection has an incidence rate of 30%. HEV escape from innate immunity, hormonal imbalances, defective monocyte–macrophage function, downregulation of the T-cell-mediated immune system, high cytokine production, nutritional factors, and socioeconomic conditions may play fundamental roles in the prevalence of HEV infection. It is necessary to take particular measures to reduce the incidence burden of HEV infection in high endemic locations as the incidence data, not the prevalence data, is more accurate at estimating disease dynamics. The purpose of this study is to throw light on several aspects of the hepatitis E virus and to discuss the incidence of HEV infection concerning other diseases. HEV molecular features, clinical features, epidemiology, extrahepatic manifestations, and multiple available diagnostics and treatment strategies for HEV are debated in the current review.