INfluenza VaccInation To Mitigate typE 1 Diabetes

Who May Qualify: - Patients hospitalized with newly diagnosed type 1 diabetes mellitus. - Written willing to sign a consent form (parents, legal guardian). Who Should NOT Join This Trial: - Influenza vaccination during the current influenza season. - Strong indication for influenza vaccination for non-diabetic disease. - Severe allergy to eggs or previous allergic reaction to influenza vaccine. - Suspicion of febrile illness or acute, ongoing infection. - Hypersensitivity to the active substances or ingredients of Vaxigrip Tetra or against any residues, such as eggs (ovalbumin or chicken proteins), neomycin, formaldehyde and octoxinol. - Patients with endogenic or iatrogenic immunosuppression that may result in reduced immunization response. - Inability to provide willing to sign a consent form from a parent or legal guardian. - Age \<7 or ≥18 years. - Previous randomization in the INVITED trial. Always talk to your doctor about whether this trial is right for you.