For the purposes of our study, confirmed cases corresponded to both ambulatory and hospitalised patients (≥ 18 years-old) admitted at our university health network (Red de Salud UC Christus) with clinical symptoms compatible with acute hepatitis, compatible laboratory tests (alanine aminotransferase (ALT) greater than 10 times the upper limit of normal – 30 U/mL – and/or elevated bilirubin level > 1 mg/dL), and a positive anti-HAV IgM from 1 June to 31 October 2017. This evidence concerns the gene GPT and Acute hepatitis.