• A nurse immuniser administers the AstraZeneca vaccine to a patient at a coronavirus disease (COVID-19) vaccination clinic at the Bankstown Sports Club

A nurse immuniser administers the AstraZeneca vaccine to a patient at a coronavirus disease (COVID-19) vaccination clinic at the Bankstown Sports Club (Photo : REUTERS/Loren Elliott)

The World Health Organization Director General Tedros Adhanom Ghebreyesus said on Wednesday that the data on the benefits and safety of a COVID-19 vaccine booster shot is inconclusive.

"When some countries afford to have the booster and others are not even vaccinating the first and second round, it's a moral issue," he said during a media briefing.

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