GPT and Acute hepatitis: A study by Tan et al [17] used retrospective data from a single hospital in Oxfordshire (United Kingdom) and found an increase in the number of adults presenting with acute hepatitis of unknown etiology (diagnosed using ICD-10 (International Statistical Classification of Diseases, Tenth Revision) diagnostic codes or ALT values of at least 2× the ULN) at the time of the non–A-E hepatitis outbreak in children, but found no increase in the number of HAdV infections in the same age group.