"Its effects will be felt for decades to come".
Officials of the agency during a virtual briefing from Geneva on Monday said this was the largest single-day increase of the virus since it was first detected in Wuhan, China.
The Director-General of the World Health Organization, Tedros Adhanom Ghebreyesus, has said the "greatest threat we face now is not the virus itself, it's the lack of global solidarity and global leadership".
"Others that had successfully suppressed transmission, are now seeing an upswing as they reopen their economies", he said. They must be "careful and creative" in finding solutions so that people stay safe while getting on with their lives.
Globally, covid-19 cases have surpassed 9 million with nearly 5 million recoveries and over 470,000 deaths.
All countries are facing a delicate balance between protecting their people while minimizing the social and economic damage.
"Unless we act now Africa is at risk of being left behind in the global vaccine race", John Nkengasong said.
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She proceeded by boasting about America's testing capabilities and saying "any suggestion that testing has been curtailed is not rooted in fact".
We continue to urge all countries to double down on the fundamental public health measures that we know work.
The next challenge is to increase production, and then quickly and equitably distribute dexamethasone worldwide, focusing on where it is needed most. As of noon EDT Monday, there had been more than 101,000 cases and more than 8,400 related deaths reported in Canada.
"Fortunately, this is an cheap medicine and there are many dexamethasone manufacturers worldwide, who we are confident can accelerate production".
'Demand has already surged, following the United Kingdom trial results showing dexamethasone's clear benefit.
Ghebreyesus said governments should be guided by solidarity in working together to ensure that supplies were prioritised for countries that have large numbers of critically ill patients and that supplies of the drug remain available to treat other diseases for which it is needed.
Over the past 24 hours, 3,847 people died from COVID-19 worldwide, taking the cumulative death toll to 469,587 fatalities, according to the report.
He said the World Health Organization was now supporting many countries in dealing with difficulties obtaining oxygen concentrators, devices that boost the flow of oxygen to support the breathing of COVID-19 sufferers.