From the Document: "In the COVID-19 [coronavirus disease 2019] vaccine program, doses are first 'allocated' and made available to states and other jurisdictions for ordering. Once ordered, doses are 'delivered' (distributed) to appropriate state and jurisdictional sites. States then allocate and deliver doses to health departments, health care systems, pharmacies, and multi-county entities, which can further re-allocate to local clinical sites. Providers then 'administer' doses to patients and report administration data to jurisdictions and CDC [Centers for Disease Control and Prevention]. (See CDC's How COVID-19 Vaccines Get to You [hyperlink] and About COVID-19 Vaccine Delivered and Administration Data [hyperlink].) Federal health care programs (e.g., Veterans Health Administration) manage vaccine data through a similar process. Comirnaty (the Pfizer-BioNTech COVID-19 vaccine) is approved [hyperlink] as a two-dose vaccine for ages 16+. Comirnaty is also authorized [hyperlink] for uses that fall outside the scope of its approval--that is, as a two-dose regimen in individuals aged 12-15, as a third dose for certain immunocompromised individuals aged 12+, and as a single booster dose to be given at least six months after the primary series in certain individuals aged 18+. For more information, see CRS Report R46913, 'FDA Approval of the Pfizer-BioNTech COVID19 Vaccine: Frequently Asked Questions.' Vaccines manufactured by Moderna (a two-dose vaccine) and J&J/Janssen [Johnson & Johnson/Janssen] (a single-dose vaccine) are currently authorized [hyperlink] for emergency use for ages 18+. The Moderna [hyperlink] vaccine is also authorized to be given as a third dose to certain immunocompromised individuals."
CRS Insight, IN11595
Congressional Research Service: https://crsreports.congress.gov/