The WHO chief, speaking to journalists, said: "I will not stay silent when the companies and countries that control the global supply of vaccines think the world's poor should be satisfied with leftovers."
Speaking from WHO's headquarters in Geneva, Tedros urged wealthy countries and vaccine makers to prioritise getting the first jabs to health workers and vulnerable populations in poorer nations over boosters.
"We do not want to see widespread use of boosters for healthy people who are fully vaccinated," he said.
The WHO called last month for a moratorium on COVID-19 vaccine booster shots until the end of September to address the drastic inequity in dose distribution between rich and poor nations.
But Tedros acknowledged Wednesday that there had "been little change in the global situations since then.
"So today I am calling for an extension of the moratorium until at least the end of the year," he said.
High-income countries had promised to donate more than one billion vaccine doses to poorer countries, he said — "but less than 15% of those doses have materialised.
"We don't want any more promises," he said. "We just want the vaccines."
Despite the call for a moratorium, some countries have been arguing for booster jabs not only for vulnerable people but also for the wider population, citing signs of waning vaccine effectiveness against the highly transmissive Delta variant.
The WHO has acknowledged that an additional dose could be needed for immunocompromised people, but stresses that for healthy people, the vaccines still seem very effective, especially in preventing severe disease.
"There is not a compelling case to move forward with a generalised recommendation for booster doses," Kate O'Brien, the WHO's vaccines chief, told Wednesday's news conference.
The UN health agency has set a global target of seeing every country vaccinate at least 10% of its population by the end of this month, and at least 40% by the end of this year.
It wants to see at least 70% of the world's population vaccinated by the middle of next year.
But Tedros lamented that while 90% of wealthy countries have hit the 10-percent mark, and more than 70% have already reached 40-percent, "not a single low-income country has reached either target".
He expressed outrage at a statement by a pharmaceutical industry organisation that the world's seven wealthiest nations, known as the G7, now had enough vaccines for all adults and teenagers — and to offer boosters to at-risk groups — and so the focus should shift to dose sharing.
"When I read this, I was appalled," he said.
"In reality, manufacturers and high-income countries have long had the capacity to not only vaccinate their own priority groups, but to simultaneously support the vaccination of those same groups in all countries."
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