Infectious diseases have always been a massive burden on the wellbeing of humans and animals, far beyond the consequences of war and natural disasters. Infectious outbreaks in animals and humans emerge unexpectedly, caused by known pathogens or by hitherto unknown pathogens. COVID-19 and avian flu have shown that the spread of animal viruses is the main source of novel viral infections in livestock and humans. With a novel virus introduction, either in the veterinary or in the human field, it is important to address several essential research questions. Important aspects are the geographic location of the introduction, the size of the epidemic, the disease association, virus evolution, mortality and morbidity, animal species involved in a transmission chain and also virus-host interactions. The objective of the HONOURs MSCA-ITN was to train young researchers on all these different aspects of emerging viral infections and the threat of zoonotic viruses. Fifteen ESRs had an individual research topic leading to a thesis defence and the awarding of a PhD degree. Specialized courses were supplied by several senior scientists of the HONOURs consortium (amongst others Prof Dr Marc van Ranst, Prof Dr Volker Thiel, Prof Dr Martin Beer, Prof Dr John Barr).