The World Health Organization expressed concern on Wednesday about the rising number of new coronavirus cases in poor countries, even as many rich nations have begun emerging from lockdown.

The global health body said 106,000 new cases of infections of the novel coronavirus had been recorded in the past 24 hours, the most in a single day since the outbreak began.

“We still have a long way to go in this pandemic,” WHO director-general Tedros Adhanom Ghebreyesus told a news conference. “We are very concerned about rising cases in low and middle income countries.”

Dr. Mike Ryan, head of WHO’s emergencies program, said: “We will soon reach the tragic milestone of 5 million cases.”

The WHO has come under fire from U.S. President Donald Trump, who accuses it of having mishandled the outbreak and of favoring China, where the virus is believed to have emerged late last year. This week Trump threatened to withdraw from the WHO and permanently withhold funding.

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Tedros acknowledged receiving a letter from Trump, but declined to comment further.

Tedros said he was committed to accountability and would carry out a review into the response to the pandemic.

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