FDA advisors recommend using Covid omicron shots for all doses

The Food and Drug Administration’s independent advisory committee on Thursday recommended replacing Pfizer and Moderna’s original Covid vaccine used in the U.S. for everyone’s first two immunizations with the new omicron shots.

If the FDA accepts the advisors’ recommendation, the U.S. would likely phase out the companies’ vaccines developed in 2020 against the original strain of Covid that first emerged in Wuhan, China.

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Instead, the drugmakers’ bivalent omicron shots that target the omicron BA.5 subvariant as well as the original strain would be used for the entire vaccination series.

Currently, Pfizer’s and Moderna’s omicron shots are only authorized as a booster, while the first two doses are still their old shots based on the original Covid strain.

The possible change would only impact people who have not yet received their two-dose primary vaccination series.

The recommendation to adopt a single formulation across all doses comes as the FDA is trying to streamline Covid vaccination so that the system is easier for the public and health-care workers to understand.

The FDA has proposed moving to a system that resembles how the agency updates and rolls out flu shots every year. The agency would select a Covid vaccine formulation in June to target the variant that is expected to dominate in the fall and winter.

Under the proposal, most people who have been exposed to the Covid spike protein twice, either through vaccination or infection, would only receive one Covid shot a year moving forward. Older adults and people with compromised immune systems may need two shots because they don’t mount as strong of an immune response.

This is a developing story. Please check back for updates.