Additional Study Information: We are seeking volunteers who have been diagnosed with COVID-19 by a healthcare provider or by lab testing. We are also looking for volunteers who have never tested positive for COVID-19 and have not received a COVID-19 vaccine. The study, also known as C-PIC, will be looking at antibody levels and how long the virus remains in the body. We are also studying the long-term complications that can occur after recovery from an acute COVID-19 infection, commonly referred to as long-COVID, long haul COVID, and post-acute sequelae of SARS-CoV-2 (PASC). At each visit, you will be asked to complete a questionnaire, and to provide blood, respiratory, and optional stool/rectal swab samples. You will be compensated $50 for each study visit, and provided an additional $10 if you provide the optional stool/rectal swab sample.