About 80% of the 5.5 billion vaccines doses that have been administered globally went to high income countries, WHO Director-General Tedros Adhanom Ghebreyesus told a news briefing on Wednesday.
"We have heard excuses from manufacturers and some high income countries about how low income countries cannot absorb vaccines," Tedros said, adding almost all low income countries have demonstrated an ability to run large-scale immunisation campaigns for polio, measles and other disease.
"Because manufacturers have prioritised or been legally obliged to fulfil bilateral deals with rich countries willing to pay top dollar, low-income countries have been deprived of the tools to protect their people," he said.
WHO has set a target to enable every country to vaccinate at least 40% of the population by the end of this year and Tedros said deliveries to poorer nations need to be boosted for this to be achieved.