I am an infectious disease epidemiologist with a particular interest in vaccine evaluation. Most of my work is on human diseases, in particular meningococcal disease, but my research encompasses a range of other infections including rabies, pneumococcus, Hib, group B streptococcus, HPV, rotavirus, and norovirus. I use a variety of methods, including field studies, observational studies, mathematical modelling and cost-effectiveness. I enjoy addressing questions of direct relevance to vaccine and public health policy.