I investigate the ecology and evolution of vertebrate pathogens, especially in birds. Fluctuations in disease cycles and emerging diseases are part of global change. Pathogens spread to new host species and ecosystems, threatening public, livestock and wildlife health. However, most wildlife pathogens are poorly known. I use field sampling, molecular screening, ecological niche modelling (ENM), and phylogenetic analyses, to understand how patterns of disease distribution and phylogeny change. I have worked on various pathogen systems: papillomavirus, poxvirus, avian influenza, avian malaria, flaviviruses.