Diseases are constantly evolving, and with global transport and changing ecologies, animal and human disease threats are constantly challenging new populations. In this changing environment, modelling is critical for understanding disease threats, and for creating disease surveillance systems for detecting new outbreaks. This session covers: population level modelling of disease spread; modelling of disease evolution; cellular level modelling of disease propagation in an organism; modelling of how a disease can effect an organism's health; modelling of medical counter measures to prevent disease propagation within an organism; and creation of disease surveillance systems using electronic data to detect and track disease outbreaks.