The 2003 SARS coronavirus outbreak, the 2009 H1N1 influenza pandemic, the 2014-15 Ebola outbreak in West Africa, and the current SARS-CoV2 pandemic remind us that emerging infectious agents do not need passports to cross international borders. Every day, there are unnoticed infectious agents that cross from one country to another. For example, respiratory viruses pass from person to person in invisible air particles and can travel around the world within hours, or international travelers may return home with a bacterial or fungal infection acquired abroad for which all available antibiotics are resistant. Infectious agents also pass from one species to another, and thus animal and human health are closely linked. Climate change allows the spread of infectious agents to areas where they did not exist or where they may have been eradicated, and expansion of human populations into natural areas increases the risk of exposure to zoonotic pathogens. This session will explore the interactions of environmental, veterinary, and human health as they impact infectious disease pathology throughout the world. Different agents and global emergencies will be presented to demonstrate the impact of infectious diseases in our practices.