Etiopathogenesis and Diagnostic Strategies in Autoimmune Hepatitis

Autoimmune hepatitis (AIH) is a chronic liver disease with the incidence of 10 to 17 per 100,000 people in Europe. It affects people of any age, but most often occurs in the 40–60 age group. The clinical picture is varied, from asymptomatic to severe acute hepatitis or liver failure. The disease onset is probably associated with the impaired function of T lymphocytes, the development of molecular mimicry, intestinal dysbiosis, or infiltration with low density neutrophils, which, alongside autoantibodies (i.e., ANA, ASMA), implicate the formation of neutrophil extracellular traps (NETs), as a component of the disease process, and mediate the inappropriate immune response. AIH is characterized with an increased activity of aminotransferases, elevated concentration of serum immunoglobulin G, the presence of circulating autoantibodies and liver inflammation. The result of the histological examination of the liver and the presence of autoantibodies, although not pathognomonic, still remain a distinguishing feature. The diagnosis of AIH determines lifelong treatment in most patients. The treatment is implemented to prevent the development of cirrhosis and end-stage liver failure. This work focuses mainly on the etiopathogenesis and diagnosis of AIH.

Severe acute hepatitis E infection presenting with acute abdomen and meningoencephalitis

We present a case of a 50-year-old man admitted due to acute abdomen, icterus and fever. The patient had a history of sufficiently treated type 2 diabetes and a high daily alcohol consumption, no recent travel history and had a strictly heterosexual and monogamous way of living. A full blood count displayed severe elevated liver enzymes. A CT of the abdomen was performed and revealed steatosis but no acute abdominal pathology. During admission, the patient developed signs of meningoencephalitis. A lumbar puncture was performed, and the cerebrospinal fluid revealed lymphocytic pleocytosis consistent with mild inflammation. Furthermore, hepatitis E was found in the blood and the definitive diagnosis was established. The patient gradually recovered and was discharged within 8 days of admission. To the best of our knowledge, we present the second case describing concomitant hepatitis and meningoencephalitis, resolving spontaneously and not giving rise to sequelae.

Severe Acute Hepatitis E in a Woman with an Autoimmune Background

Hepatitis E virus genotype 3 infections are normally asymptomatic in immunocompetent individuals. Symptomatic cases of acute icteric hepatitis E are seldom observed among women, younger men and children but are particularly seen in middle-aged/elderly men. We report a case of severe acute hepatitis E caused by genotype 3 in an immunocompetent 40-year-old woman that required prolonged hospitalization. Her medical history included an autoimmune background, namely atrophic gastritis and Graves’ disease. She presented an extensive hepatic necrosis as revealed by the high levels of aminotransferases (ALT 4893 U/L; AST 3138 U/L). She showed also a coagulation disorder (prothrombin time; INR = 1.33). Serological markers for hepatitis viruses A, B and C were negative but serum was positive for hepatitis E virus RNA. Sequencing and phylogenetic analysis revealed that the hepatitis E virus strain belonged to subgenotype 3a. This is suggestive of an association between the severe acute hepatitis E virus genotype 3 infection and the autoimmune background.

Epidemiology of Hepatitis E in England and Wales: A 10-Year Retrospective Surveillance Study, 2008–2017

Indigenous, foodborne transmission of hepatitis E virus genotype 3 (HEV G3) has become recognized as an emerging problem in industrialized countries. Although mostly asymptomatic, HEV G3 infection has a range of outcomes, including mild illness, severe acute hepatitis, and, of particular concern, chronic progressive hepatitis in immunocompromised patients. Public Health England has monitored cases of acute HEV infection in England and Wales since 2003. Between 2010 and 2017, enhanced surveillance using 2 linked laboratory databases and questionnaires on clinical features and risk factors was conducted. There was a year-on-year increase in the number of infections from 2008 (183) through 2016 (1243). Then, in 2017, the number of infections declined (to 912). As reported previously, HEV G3 group 2 (also known as “G3 abcdhij”) is the predominant cause of acute infections, and older men are most at risk. Consumption of pork and pork products was significantly higher among patients than in the general population, but other previously reported associations, such as consumption of shellfish, were not observed. Ongoing surveillance is required to monitor future trends and changes in the epidemiology of the virus. The changing methods of animal husbandry and processing and distribution of animal products needs to be further investigated.