Alistair Antonopoulos (Author) Alistair Antonopoulos is a scientific project manager working at Kreavet. He graduated from the University of Glasgow with a PhD in Veterinary Medicine. He previously developed novel molecular diagnostics for anthelmintic resistance and a next-generation sequencing assay to aid in the sustainability of livestock production. Alistair has been involved in multiple multidisciplinary and international projects. In Kreavet, he is contributing to the conduct and development of multi-actor Horizon EU funded projects such as BIOSECURE, focused on improving biosecurity implementation within Europe for sustainable livestock production. As part of the BIOSECURE consortium, Alistair has been involved in the creation of a database of modelling parameters for livestock disease transmission, in addition to stakeholder disease prioritisation exercises at the EU and participating country level.Evelien Biebaut (Author) Evelien Biebaut is a post-doctoral researcher at the Veterinary Epidemiology Unit of Ghent University, currently serving as scientific manager for the Horizon Europe BIOSECURE project. She earned her PhD from the Faculty of Veterinary Medicine also at Ghent University, where her research focused on Mycoplasma hyopneumoniae infections in pigs, with a particular emphasis on transmission dynamics and immune responses. Passionate about advancing animal health and welfare, Evelien is committed to improving livestock management practices for the benefit of both animals and humans.Jeroen Dewulf (Author) Jeroen Dewulf serves as a full professor in Veterinary Epidemiology at the Faculty of Veterinary Medicine of Ghent University. His primary research interests include antimicrobial use and resistance in animals, as well as the prevention of epidemic and endemic diseases with an emphasis on biosecurity. He is passionate about turning data in to veterinary expertise and policy for the benefit of animal and human health. Jeroen Dewulf is a prolific author with (co-)authorship of over 400 A1 publications in the field. Recently, he co-founded the spin-off company Biocheck.Gent and coordinates the EU research consortium BIOSECURE, which focuses on cutting-edge research in biosecurity in terrestrial animal production.Johannes Charlier (Author) Johannes is a veterinary scientist and regularly invited speaker at international workshops or conferences. After a career of 13 years as veterinary parasitologist at Ghent University, and 2 years as scientific director in Avia-GIS, he founded the research agency Kreavet in 2017. He described his view on sustainable parasite and animal health management in a series of recognized review and opinion papers. The principles of those papers are a guideline for the development and strategies of Kreavet. Johannes is a EBVS® European Veterinary Specialist in Parasitology and received several scientific awards for his contributions to veterinary parasitology and epidemiology. He is (technical) coordinator of European funded projects including the secretariat of the STAR-IDAZ IRC, SPARC and DISCONTOOLS. He sits in the board of various scientific organisations and periodically acts as (guest-)editor for scientific journals.

• Chapter 1: Principles and Terminology in Biosecurity Chapter 2: Endemic Diseases of Livestock Chapter 3: Epidemic Diseases of Livestock

Alistair Antonopoulos (Author) Alistair Antonopoulos is a scientific project manager working at Kreavet. He graduated from the University of Glasgow with a PhD in Veterinary Medicine. He previously developed novel molecular diagnostics for anthelmintic resistance and a next-generation sequencing assay to aid in the sustainability of livestock production. Alistair has been involved in multiple multidisciplinary and international projects. In Kreavet, he is contributing to the conduct and development of multi-actor Horizon EU funded projects such as BIOSECURE, focused on improving biosecurity implementation within Europe for sustainable livestock production. As part of the BIOSECURE consortium, Alistair has been involved in the creation of a database of modelling parameters for livestock disease transmission, in addition to stakeholder disease prioritisation exercises at the EU and participating country level.Evelien Biebaut (Author) Evelien Biebaut is a post-doctoral researcher at the Veterinary Epidemiology Unit of Ghent University, currently serving as scientific manager for the Horizon Europe BIOSECURE project. She earned her PhD from the Faculty of Veterinary Medicine also at Ghent University, where her research focused on Mycoplasma hyopneumoniae infections in pigs, with a particular emphasis on transmission dynamics and immune responses. Passionate about advancing animal health and welfare, Evelien is committed to improving livestock management practices for the benefit of both animals and humans.Jeroen Dewulf (Author) Jeroen Dewulf serves as a full professor in Veterinary Epidemiology at the Faculty of Veterinary Medicine of Ghent University. His primary research interests include antimicrobial use and resistance in animals, as well as the prevention of epidemic and endemic diseases with an emphasis on biosecurity. He is passionate about turning data in to veterinary expertise and policy for the benefit of animal and human health. Jeroen Dewulf is a prolific author with (co-)authorship of over 400 A1 publications in the field. Recently, he co-founded the spin-off company Biocheck.Gent and coordinates the EU research consortium BIOSECURE, which focuses on cutting-edge research in biosecurity in terrestrial animal production.Johannes Charlier (Author) Johannes is a veterinary scientist and regularly invited speaker at international workshops or conferences. After a career of 13 years as veterinary parasitologist at Ghent University, and 2 years as scientific director in Avia-GIS, he founded the research agency Kreavet in 2017. He described his view on sustainable parasite and animal health management in a series of recognized review and opinion papers. The principles of those papers are a guideline for the development and strategies of Kreavet. Johannes is a EBVS® European Veterinary Specialist in Parasitology and received several scientific awards for his contributions to veterinary parasitology and epidemiology. He is (technical) coordinator of European funded projects including the secretariat of the STAR-IDAZ IRC, SPARC and DISCONTOOLS. He sits in the board of various scientific organisations and periodically acts as (guest-)editor for scientific journals.

• Chapter 1: Principles and Terminology in Biosecurity Chapter 2: Endemic Diseases of Livestock Chapter 3: Epidemic Diseases of Livestock