Some 83 aid workers, a quarter of them employed by the WHO, were involved in sexual coercion and abuse during the country's 10th Ebola epidemic, an independent commission said last year.

"(We) hope to see sustained senior management engagement on this matter, to strengthen WHO's approach and ensure zero tolerance for inaction," said Britain's ambassador to the United Nations in Geneva Simon Manley on behalf of the European Union, Canada, South Africa and others.

(Reporting by Emma Farge; Editing by Toby Chopra)