Inclusion Criteria for patients with type 1 diabetes:  age >16 History of type 1 diabetes previous blood test in search for SARSCoV2 antibodies willingness to provide informed consent  Exclusion Criteria for patients with type 1 diabetes:  age <16 years Systemic infections Diabetic ketoacidosis in the past 6 weeks COVID-19 diagnosis in the previous 6 months  Inclusion Criteria for non-diabetic subjects:  age >16 No previous history of diabetes previous blood test in search for SARSCoV2 antibodies willingness to provide informed consent  Exclusion Criteria for non-diabetic subjects:  age <16 years Systemic infections COVID-19 diagnosis in the previous 6 months  Inclusion Criteria for patients with type 2 diabetes:  age >16 History of type 2 diabetes but no evidence of autoantibodies previous blood test in search for SARSCoV2 antibodies willingness to provide informed consent  Exclusion Criteria for patients with type 2 diabetes:  age <16 years Systemic infections COVID-19 diagnosis in the previous 6 months