Confirmed US deaths stood at 100,396 late Wednesday, with nearly 1.7 million infections, according to the tally compiled by Johns Hopkins University.
Brazil has now confirmed a total of 24,512 deaths.
Elsewhere, gyms and swimming pools reopened in Germany, Iceland, Italy and Spain.
The first lady of the US wore a white double-breasted coat with gold military-style buttons and paired it with stiletto pumps.
The 20-nations accounting for 90 percent of global GDP should prioritise investment in public health, clean air, clean water and a stable climate.
Governments including the US and Australia have called in recent weeks for an investigation into the exact origins of the virus.
The US announced sanctions against a Chinese government institute and eight companies for human rights violations.
FLOTUS joined her husband and Mike Pence on a call with state governors, on the need to address the issues of mental health among children.
The announcement came as the US COVID-19 death toll approaches the 100,000 mark.
The WHO said that 106,662 virus cases reported to the UN agency on Tuesday -- the most in a single day since the outbreak erupted in Wuhan in December.
President Bolsonaro has refused to accept health experts' recommendations on responding to the pandemic.
It comes after the hackers claimed that they have sold all their 'dirty laundry' on US President Donald Trump.
Washington is locked in an increasingly bitter spat with Beijing over the new coronavirus pandemic and has also taken aim at the WHO.
Trump's latest remarks came out of the blue, immediately grabbing headlines on a day when US deaths from COVID-19 topped 90,000 people.
Many heads of state, government chiefs, health ministers, other dignitaries are expected to attend the meeting around noon on Monday.
Allen Grubman's law firm represents stars including Lady Gaga, Madonna, Mariah Carey, U2, Bruce Springsteen, Priyanka Chopra, Bette Midler and more.
The downbeat mood was compounded by another spike in US jobless claims and overshadowed news several countries were easing strict lockdown measures.
Trump earlier this week ruled out renegotiating the partial trade deal inked in January, when asked about reports that China was looking to reopen talks.
The Brazilian diplomat, who became the WTO chief in 2013, suggested that an early change of leadership would help it face "new post-COVID realities".
Several UN envoys have predicted that the meeting will end up via videoconference, especially as this year marks the 75th anniversary of the world body.
The row started after Kimmel aired an edited video of Vice-President Mike Pence delivering "empty boxes of PPE" to a hospital.
Around 1,438 coronavirus patients in various hospitals in New York were part of a study conducted by a research team from the University at Albany.