In a four-page letter detailing his grievances with the WHO, Trump called on the group to "demonstrate independence from China", renewing a complaint that led him in April to temporarily suspend USA funding.
Even in the worst-affected regions, the proportion of the population with the tell-tale antibodies is no more than 20 per cent, and in most places, less than 10 per cent, Tedros said.
The World Health Organization said on Monday an independent review of the global coronavirus response would begin as soon as possible and it received backing and a hefty pledge of funds from China, in the spotlight as the origin of the pandemic. Administration officials have looked to redirect the WHO payments to other nongovernmental public health organizations, The Washington Post reported.
Trump has accused the World Health Organization of blindly taking the word of China, where the SARS-CoV-2 virus was first detected.
The virus has killed more than 90,000 people in the U.S., while more than 318,000 are dead worldwide since December when the virus was first detected in Wuhan city, China.
On April 14, President Trump halted America's funding of up to Dollars 500 million annually to the World Health Organisation while a review is being done to assess its role in "severely mismanaging and covering up" the spread of the deadly coronavirus when it first emerged in the central Chinese city of Wuhan.
The Chinese government immediately hit back and said the United States was using China as an excuse to shirk financial obligations that had been jointly determined by World Health Organization member states.
The "comprehensive evaluation", sought by a coalition of African, European and other countries, is meant to review "lessons learned" from WHO's coordination of the global response to COVID-19, but would stop short of looking into contentious issues such as the origins of the new coronavirus.
"We all have lessons to learn from the pandemic". As with nearly every organization under the United Nations umbrella, such changes would require approval from the countries that belong to the agency, which include China and many developing countries that rely on the agency for crucial medical assistance. "World Health Organization must change, and it must become far more transparent and far more accountable", he said.
"Every country and every organization must examine its response and learn from its experience", he said, adding that the review must cover "all actors in good faith". He also accused the agency of "making claims" on the coronavirus "that were grossly inaccurate or misleading" and giving in to the alleged "pressure" made by the Chinese president Xi Jingping in order not to proclaim the coronavirus outbreak an emergency.
He has also faced criticism over how the White House initially responded to the virus.
The WHO chief's remarks followed an address by Chinese President Xi Jinping who backed the review of global health response to Covid-19, but said such an evaluation should happen only after the pandemic was over.
Xi said China supports the idea of a comprehensive review of the global response to COVID-19 and that it should be "based on science and professionalism led by World Health Organization, and conducted in an objective and impartial manner".
Antonio Guterres, UN secretary-general, called for greater unity and solidarity, saying the COVID-19 crisis should serve as a "wake-up call".
Tedros said the pandemic has exposed critical fault lines between countries that could jeopardize stopping the virus.