A day after the WHO presented a shortlist of candidates for the role of its next director-general, the finalists offered their visions for the organisation to reporters in Geneva.
Their presentations were overshadowed by reports that the United States, the WHO's largest donor, under President Donald Trump is eyeing drastic funding cuts to international organisations.
Commenting on the prospect, one of the candidates, senior Ethiopian politician Tedros Adhanom, said the organisation needed to "expand the donor base."
UN veteran David Nabarro of Britain also tried to downplay the threat while pledging change.
"I don't think that if we (make reforms) we will necessarily be cut off from money," he said.
He said he understood that the Trump administration wanted to be sure "that the organisation is working for impact in the most effective, efficient and transparent way."
Nabarro then described the concerns being raised in Washington as "an invitation to dialogue and an invitation to openness. And I am totally up for that and look forward to it."
The complaints boiled over during the 2014 Ebola epidemic in west Africa, when the WHO was found to have missed glaring warning signs about the severity of the crisis that ultimately killed more than 11,000 people.
Echoing reform promises from the other two finalists, Nishtar insisted that "we require a culture change within WHO."
The organisation, she said, needed to be "more result-oriented and more resilient" and should strive to "demonstrate value for money.
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