Celebrate World Hepatitis Day 2023 by learning about autoimmune hepatitis: a chronic inflammatory liver disease. Get the facts and join the fight against viral hepatitis. World Hepatitis Day is annually commemorated on July 28th. According to the American National Institute of Health, the prevalence of autoimmune hepatitis is estimated to be between four to 43 cases per 100,000 adults and approximately two to ten cases per 100,000 children