He is a clinical and public health virologist with a particular interest in emerging viral diseases at the animal-human interface – using a “One-Health” approach. His research encompasses the pathogenesis, innate immune responses, transmission, ecology and epidemiology of human and animal influenza viruses such as avian influenza subtypes H5N1, H9N2 and H7N9, the emergence of the 2009 pandemic H1N1 from swine, and coronaviruses such as SARS-CoV-1, MERS-CoV, and SARS-CoV-2.