Margaret Hosie is Professor of Comparative Virology at the MRC-University of Glasgow Centre for Virus Research. As a veterinarian, her most significant scientific contributions have included the identification of determinants of virulence amongst feline immunodeficiency virus (FIV) isolates, the development of methods to confirm FIV and feline leukaemia virus (FeLV) infections in diagnostic samples, the identification of vaccine-induced enhancement of FIV infection, and elucidation of the mechanism of protection induced by whole-inactivated FIV vaccines. She has also identified immunological correlates of feline retroviral infection and discovered the primary and co-receptor molecules for FIV infection. Over the years, her research findings have had implications for improving feline welfare as well as having wider, comparative significance. During the COVID-19 pandemic, she was a contributing editor for the UKRI website https://coronavirusexplained.ukri.org/en/ and she led the team that identified the first UK cat infected with SARS-CoV-2. She has been a member of the European Advisory Board for Cat Diseases (ABCD) since 2005 and is currently the President of the newly established Association, ABCD Europe.