The new head of the World Health Organisation (WHO) has cancelled the appointment of Zimbabwe's Robert Mugabe as ambassador amid outcry.

"I have listened carefully to all who have expressed their concerns," WHO head Tedros Adhanom Ghebreyesus said in a statement.

He had previously praised Zimbabwe for its commitment to public health.

But critics pointed out that Zimbabwe's healthcare system had collapsed under Mr Mugabe's 30-year rule.

Dr Tedros Adhanom Ghebreyesus's original proposal sparked an outcry. He had previously praised Zimbabwe for its commitment to public health.

But Mr Mugabe's critics say Zimbabwe's healthcare system has collapsed under his 30-year rule, with staff often going without pay while medicines are in short supply.

It led Zimbabwean human rights lawyer Doug Coltart to take to Twitter to question how the WHO felt about having "a Goodwill Ambassador who destroyed the health sector in his country".

Other social media users accused the president - who, at 93, has outlived his country's average life expectancy by more than three decades - of travelling abroad to receive his own medical treatment.

Meanwhile, the UK government described his selection as "surprising and disappointing" given his country's human rights record, and warned it could overshadow the WHO's work.

Canadian Prime Minister Justin Trudeau said he "thought it was a bad April Fool's joke", while the US state department said it "clearly contradicts the United Nations ideals of respect for human rights and human dignity".

Zimbabwe's leader has been frequently taken to task over human rights abuses by both the EU and the US.

Other groups who have criticised Mr Mugabe's appointment include the Wellcome Trust, the NCD Alliance, UN Watch, the World Heart Federation and Action Against Smoking.

Dr Tedros had said Zimbabwe was a country that "places universal health coverage and health promotion at the centre of its policies to provide health care to all".

However, the Ethiopian said on Saturday he was "rethinking his approach in light of WHO values".

Mr Mugabe was supposed to be goodwill ambassador "to help tackle non-communicable diseases", which includes things like heart attacks and asthma.

Dr Tedros is the first African to lead the WHO. He was elected in May with a mandate to tackle perceived politicisation in the organisation.