The U.S. Food and Drug Administration is close to making a decision on authorization of a second dose of updated COVID-19 vaccine boosters for high-risk people, the Wall Street Journal reported on Tuesday, citing sources.

FDA officials could make the decision within a few weeks, the WSJ said, adding the regulator is considering authorizing second jabs of omicron-targeted shots for people who are 65 years and older or those who have weakened immune systems, although officials are yet to reach a final decision.

The Centers for Disease Control and Prevention would have to recommend the shots after the FDA authorizes the second omicron-tailored boosters from Pfizer-BioNTech /and Moderna for them to become widely available.

The decision comes at a time when the FDA plans to shift to an annual COVID booster campaign with an updated strain, similar to the way Americans receive their flu shots.

Updated boosters have helped prevent symptomatic infections against the new XBB-related subvariants, according to data released by CDC in January.

FDA authorized the so-called bivalent COVID boosters in August that target the BA.4 and BA.5 omicron subvariants, along with the original strain of the coronavirus. Rollout of the updated boosters in the United States started the following month.

As of March 15, around 54 million bivalent vaccine doses were administered, accounting for 16.4% of the U.S. population, according to government data.

A spokesperson for the FDA did not comment on the report.