Many people will be convinced that they've caught the flu, but at least in the early part of the winter, that won't be the case. The flu doesn't usually arrive in the colder parts of the northern hemisphere until about Christmas time or January. Where pandemics come from, and how they change and seasonal flus, in other words, how the flu virus evolves, will be one of our main topics in the course. As well as studying the public health aspects of influenza, we will be looking in some detail of the virus itself. And by learning about flu viruses, you will acquire a body of knowledge that will also help your general understanding of other viral diseases.