From the Document: "The U.S. Food and Drug Administration (FDA) has authorized for emergency use Coronavirus Disease 2019 (COVID-19) vaccines sponsored by Pfizer/BioNTech and Moderna. Several other COVID-19 vaccines are currently in clinical trials; additional vaccines may become available within months. Operation Warp Speed (OWS)--the COVID-19 medical countermeasure initiative led by the Department of Health and Human Services (HHS) and the Department of Defense (DOD)--has contracted with manufacturers to purchase hundreds of millions of doses (including Pfizer/BioNTech and Moderna's vaccines) and related supplies. OWS is also planning and implementing a nationwide vaccine program. OWS has thus far been financed largely by emergency funding provided in the coronavirus supplemental appropriations acts. [...] This Insight provides overviews of supplemental appropriations for selected vaccine-related activities and available information on allocations and obligations. It does not address health care financing issues related to vaccine administration or regular appropriations."
CRS Insight, IN11556
Congressional Research Service: https://crsreports.congress.gov/