The second section looks at a number of key emerging infectious diseases and in each case details how a One Health approach has added value, particularly in terms of disease control and cost outcomes. The examples cover virus, bacterial, protozoal and parasitic infections and provide case studies at the national, regional and global level. The studies themselves vary in depth and detail but provide an engaging set of examples of the value of a One Health approach. In all cases, the authors have local and personal experience of the disease in question, providing real life examples of what can be achieved. The final chapter entitled "Men, primates and germs: an ongoing affair" provides a fascinating insight into pathogen host switching between closely related species which serves to illustrate a core value of a One Health approach.