This is the recording of Dr. Jonathan Kerr’s lecture at the Mourne Country Hotel, Newry on 30th October 2018. Dr. Kerr, BSc, MBBCh, MD, PhD, FRCPath, is a researcher who became interested in ME/CFS after studying the consequences of Parvovirus B19 infection and finding that some of those infected went on to develop CFS. Formerly of St. George’s University of London, he is presently working as an Associate professor in the School of Medicine and Health Sciences at Universidad del Rosario, Bogotá, Colombia. The lecture was organised by Hope 4 ME & Fibro NI.