Inclusion Criteria:  People who have been fully vaccinated for COVID-19 2-12 weeks prior to enrollment or individuals <3 months post-COVID-19 infection. Collection of samples for blood samples will be done only from healthy, nonpregnant adults who weigh at least 110 pounds. Participants must be able to provide informed consent.  Exclusion Criteria:  -Subjects considered vulnerable including children, pregnant women, nursing home residents, or other institutionalized persons, fetuses, prisoners, and persons without decisional capacity.