My research uses mathematical techniques to address scientific questions in the field, particularly to understand infectious disease. My main interest is influenza, but at many different scales: from the dynamics and evolution of influenza at the global scale, spread at national scales right through to transmission and within-host dynamics at the individual scale. I am also interested in understanding infection and immunity at smaller scales and current projects include in vitro dynamics of salmonella, and methods to detect certain signals in viral genomes.