Rob Christley, CH4D project Principal Investigator (PI) and Reader in Epidemiology at the University of Liverpool spent 7 days (beginning of May 2012) in Debre Zeit and Addis Ababa. As well as meeting with the team and partner organisations. Rob assisted Brehanu Abera to undertake data analysis. Brehanu, an MSc student at the Addis Ababa Veterinary School, has been working with the CH4D team to investigate the seroprevalence of Newcastle Disease and has been investigating the effects of endoparasitism on the immunological response to Newcastle Disease vaccination in local chickens. Rob also gave a seminar on the application of epidemiology to poultry research and on the estimation of study sample sizes.