Infectious diseases affect individuals (immunology) and populations (epidemiology). While these two scales of infection are intimately linked, the vast majority of studies of infectious diseases ignore the effects of the other scale. This means that public health control programs may either under-estimate, or over-estimate the need of vaccines, therapeutics or education programs, depending on the simplifying assumptions on the other scale of infection. Mathematical models that link the in-host and population scales of infection can better inform public health programs so that infection control can be achieved. In this WICI talk, Dr. Jane Heffernan discusses mathematical models that link in-host effects to population level infection outcomes. In particular, she discusses the effects of vaccination, waning immunity, and behaviour change. Influenza, measles, and pertussis (whooping cough) among other diseases will be highlighted. wici.ca/new/2015/11/multi-scale-modelling-of-infectious-dis