evidence: The US government is no longer purchasing COVID-19 vaccines; therefore, the CDC COVID-19 Vaccination Program has ended. Updated 2023–2024 COVID-19 vaccines are now available for private purchase in the commercial marketplace. [...] With these FDA and CDC actions, the CDC COVID-19 Vaccination Program ended as of September 12, 2023, as it applied to the administration of the bivalent Moderna and Pfizer-BioNTech mRNA COVID-19 vaccines previously provided by the US Government (USG). Now, with FDA’s authorization on October 3, 2023, of the 2023–2024 Novavax COVID-19 Vaccine, Adjuvanted, the CDC COVID-19 Vaccination Program has fully ended as of October 3, 2023. All authorized/approved doses of COVID-19 vaccine in the United States are now the 2023–2024 formulas. [...] Until September 12, 2023, all COVID-19 vaccine in the United States had been purchased by the United States Government (USG) for administration exclusively through the CDC COVID-19 Vaccination Program. Providers are prohibited from selling USG-purchased COVID-19 vaccine doses.