Coronavirus Disease 2019 (COVID-19) is a disease caused by a virus called SARS-CoV-2. Most people with COVID-19 have mild symptoms, but some people become severely ill. Older adults and people who have certain underlying medical conditions are more likely to get severely ill. Post-COVID conditions are a wide range of health problems people can experience four or more weeks after first getting COVID-19. Even those who do not become severely ill from COVID-19 may experience post-COVID conditions. Since the beginning of the COVID-19 Global Pandemic, there have been 90,369,831 confirmed cases of COVID-19 and 1,022,688 confirmed COVID-19-related deaths in the United States. 222,950,194 U.S. residents have received at least a full vaccine series to reduce the likelihood of transmission.