Inclusion Criteria for Sarcoidosis Subjects:  Age 18 years or older Diagnosis of sarcoidosis Receives clinical care at Northwestern Medicine in the Pulmonary Clinic, Cardiology Clinic or other Northwestern Medicine clinical unit Completed primary vaccination, or primary plus booster vaccination, with the Pfizer-BioNTech BNT162b2, Moderna mRNA-1273, or Johnson & Johnson JNJ-78436735 SARS-CoV-2 vaccine at least two weeks prior to enrollment  Exclusion Criteria for Sarcoidosis Subjects:  • Unable to provide informed consent in English  Inclusion Criteria for Healthy Controls:  Age 18 years or older Completed primary vaccination, or primary plus booster vaccination, with the Pfizer-BioNTech BNT162b2, Moderna mRNA-1273, or Johnson & Johnson JNJ-78436735 SARS-CoV-2 vaccine at least two weeks prior to enrollment  Exclusion Criteria for Healthy Controls:  Diagnosis of sarcoidosis or autoimmune diseases Diagnosis of chronic lung disease Diagnosis of heart disease Diagnosis of cancer Currently taking immunosuppressive medications Unable to provide informed consent in English