The head of the World Health Organisation is calling on countries with large supplies of coronavirus vaccines to refrain from offering booster shots through the end of the year, expanding a call that has largely fallen on deaf ears.

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WHO Director-General Tedros Adhanom Ghebreyesus also said on 8th September he was appalled at comments by a leading association of pharmaceutical manufacturers who said vaccine supplies are high enough to allow for both booster shots and vaccinations in countries in dire need of jabs but facing shortages.

"I will not stay silent when companies and countries that control the global supply of vaccines think the world's poor should be satisfied with leftovers," he told a news conference. Tedros had previously called for a moratorium on booster shots through the end of September, but the United States and other countries have begun or are considering plans to offer them to their vulnerable people.