Add Omicron BA.4/5 Component to Boosters: FDA

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FDA has told Covid-19 vaccine manufacturers seeking to update their vaccines that they should develop modified vaccines that add an omicron BA.4/5 spike protein component to the current vaccine composition to create a two-component (bivalent) booster vaccine. This follows advice from the agency’s Vaccines and Related Biological Products Advisory Committee 6/28 recommending  an omicron variant component for use this fall and winter (see earlier story). During the meeting, FDA officials predicted another late-year Covid infection wave as people remain indoors again during the colder months.

“As we expect this coming year to be a transitional period when this modified booster vaccine may be introduced, we have not advised manufacturers to change the vaccine for primary vaccination, since a primary series with the FDA-authorized and approved Covid-19 vaccines provides a base of protection against serious outcomes of Covid-19 caused by circulating strains of SARS-CoV-2,” an agency notice says.

The agency also says vaccine manufacturers have already studied modified vaccines containing an omicron BA.1 component and they have been asked to submit this for further review before seeking a potential authorization of a modified vaccine containing an omicron BA.4/5 component. “Manufacturers will also be asked to begin clinical trials with modified vaccines containing an omicron BA.4/5 component, as these data will be of use as the pandemic further evolves,” it says.

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