Chapter 1: Introduction. Centring animals within medical history.- Chapter 2: Doctors in the Zoo: Connecting human and animal health in British zoological gardens, c1828-1890; Abigail Woods.- Chapter 3: From co-ordinated campaigns to water-tight compartments: Diseased sheep and their investigation in Britain, c1880-1920; Abigail Woods.- Chapter 4: From healthy cows to healthy humans: Integrated approaches to world hunger, c1930-65; Michael Bresalier.- Chapter 5: The Parasitological Pursuit: Crossing species and disciplinary boundaries with Calvin W. Schwabe and the Echinococcus tapeworm, 1956-1975; Rachel Mason Dentinger.- Chapter 6: Humans, other animals and 'One Health' in the early twenty-first century; Angela Cassidy.- Chapter 7: Conclusion.- Appendix: Annotated bibliography