The main research interest is in the field of infectious complications in transplant recipients and he participated in many research projects in this area. He is the author or co-author of more than 200 publications in the field of infectious disease in immunocompromised patients. From 1999 he is the advisor for all infectious diseases related problems at the Italian National Centre for Transplantation in Italy and covers the role of “second opinion” for all organ donors with potentially transmissible infectious diseases. Since 2001 he is a member of the Steering Committee of the program of Liver, kidney, kidney-pancreas, Lung and Heart transplantation in HIV+ individuals in Italy. In April 2013 he was elected co-Chair of the ID Council of the International Society of Heart and Lung Transplantation and subsequently chair of the ID committee. He is currently the past chair of the ID council of ISHLT. From April 2019 he is the chair of the ESCMID study group on infections in immunocompromised host (ESGICH). In July 2013 he was nominated member of the WHO International Health Regulations Roster of Experts, as an expert in Essential health technologies (Transplantation services).