Sarah Catherine Gilbert (born April 1962) is a British vaccinologist who is Professor of Vaccinology at the University of Oxford and co-founder of Vaccitech.[1][3][4][5][6] Gilbert specialises in the development of vaccines against influenza and emerging viral pathogens.[7] She led the development and testing of the universal flu vaccine, which underwent clinical trials in 2011. In April 2020, Gilbert claimed that with more funding, she could deliver a COVID-19 vaccine by September 2020.