Despite President Biden’s recent admission that the COVID-19 pandemic is over, the White House is making another big push to encourage Americans to get yet another COVID booster shot. This time, the Biden administration is marketing the COVID Bivalent versions of messenger RNA (mRNA) Comirnaty and Spikevax biologics developed by Pfizer/BioNTech and Moderna/NIAID respectively.

These experimental “bivalent formulations” of the shots, which contain the original strain of the SARS-CoV-2 virus and the other one in common between the BA.4 and BA.5 lineages of the Omicron variant of SARS-CoV-2, were approved for use as a single booster dose by the U.S. Food and Drug Administration (FDA) on Aug. 31, 2022.

The U.S. government has reportedly secured 105 million doses of the Pfizer/BioNTech Bivalent booster and 66 million doses of the Moderna/NIAID Bivalent booster. These may be the last doses of the shots offered free to the public by the federal government.