Progression from acute to chronic hepatitis B is more common in older adults.

Purpose: The rate of progression of acute Hepatitis B (HBV) to chronic disease is quoted as <10%. The purpose of this study was to determine the rate of progression from acute to chronic HBV in Northern Ireland (NI), assessing the influence of age, gender and biochemical parameters.

Methods: All "acute" HBV cases diagnosed in NI between 2011 and 2015 were reviewed.