Inclusion Criteria:  Patients must meet all of the following inclusion criteria to be eligible for inclusion in the study:  Unique enrollees in the HealthVerity Vaccine dataset anytime after December 10, 2020 At least 12 years on the index date (ie, first vaccination date) No evidence of prior COVID-19 infection (a medical claim, pharmacy claim, or chargemaster record with a diagnosis code of ICD-10-CM U07.1) in the 12 months prior to the index date Have 12 months of continuous enrollment with medical benefits (with or without pharmacy benefits) prior to the index date.  Subjects with an IC condition will be identified via an algorithm developed for use in administrative claims database studies.  Exclusion criteria: subjects not meeting the criteria above will be excluded.