inclusion criteria: - patients 40 years-old and over who are admitted to the university of illinois hospital (uic) due to covid-19 - positive oropharyngeal and/or nasopharyngeal swab test for sars-cov-2 by rt-pcr within the preceding 72 hours (performed by university of illinois hospital laboratories or, if performed elsewhere, documented in the patient's uic medical record) - symptomatic infection with any of the following: fever, cough, dyspnea, or tachypnea > 22 breaths/min - need for supplemental oxygen, between 1-5 liters/minute by nasal canula, to maintain o2 saturations >92% - consents to comply with all protocol requirements - agrees to storage of specimens for future testing

inclusion criteria: - patients 40 years-old and over who are admitted to the university of illinois hospital (uic) due to covid-19 - positive oropharyngeal and/or nasopharyngeal swab test for sars-cov-2 by rt-pcr within the preceding 72 hours (performed by university of illinois hospital laboratories or, if performed elsewhere, documented in the patient's uic medical record) - symptomatic infection with any of the following: fever, cough, dyspnea, or tachypnea > 22 breaths/min - need for supplemental oxygen, between 1-5 liters/minute by nasal canula, to maintain o2 saturations >92% - consents to comply with all protocol requirements - agrees to storage of specimens for future testing