Professor Mellanby visited Phoenix this week to present some of the latest research from the VitDAL at the ACVIM Forum. He presented some recent data from VitDAL alongside Dr Jaffey from Midwestern University in a talk entitled ‘Vitamin D : a new role in infectious disease’. They reviewed data demonstrating that vitamin D homeostasis is altered in companion animals with infectious diseases and then discussed data from VitDAL which showed how vitamin D metabolites can influence the immune response. They also discussed how inflammation can also influence vitamin D status, revealing the bi-directional relationship between vitamin D status and immune response.