Japan is set to miss a target to give COVID-19 booster shots to almost 15 million people this month after the fast spread of the omicron variant threw initial rollout plans into disarray.

About 2.6 million people had received their third dose as of Tuesday, about 18% of the target for January, according to government figures. Japan so far limits its booster program to health care workers and the elderly, meaning just 2.1% of the total population have had the latest shot, the lowest ratio among developed nations, according to the Bloomberg Vaccine Tracker.

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