Inclusion Criteria:  Males and females ≥13 years old. Not vaccinated and were previously positive for COVID-19 OR are vaccinated for COVID-19. Provides test report to demonstrate prior COVID-19 positive result (only applicable to unvaccinated subjects who were previously positive for COVID-19, not applicable for COVID-19 vaccinated subjects). Provides informed consent and completed questionnaire. Able to register the collection kit on the DxTerity portal. Able to collect and ship blood samples back to DxTerity.  Exclusion Criteria:  Unable to provide COVID-19 positive test report (only applicable to unvaccinated subjects who were previously positive for COVID-19, not applicable for COVID-19 vaccinated subjects). Unable to complete informed consent and/or questionnaire. Unable to complete the study activities in a timely manner.