Katie Ewer is a cellular immunologist specialising in immune responses to vaccines. She is an Associate Professor at the Jenner Institute at the University of Oxford, acting as senior immunologist for clinical trials of Oxford's Ebola and pre-erythrocytic malaria vaccines. She oversees the immunology on Phase I, II and III trials of new malaria vaccines, both in the UK and in field trials in Africa.
Having earned her PhD in 2004, Katie joined the UK's Animal and Plant Health Agency where she studied the effectiveness of TB vaccines in cattle and managed the roll-out of interferon-gamma-based diagnosis for bovine TB in the UK herd, before moving to the Jenner Institute in 2008.
During the Covid-19 pandemic, Katie was an investigator on clinical trials of the Oxford/AstraZeneca COVID vaccine, studying samples from volunteers to determine the strength of their cellular immune response to vaccination and how those responses relate to protection against COVID-19 infection.